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# Why can light travel through a vacuum but sound cannot

### why light can travel in vacuum where as sound can not do

Light waves can propagate through vacuum as they do not get dispappear after some time and hence do not require medium for propagation. However, sound waves are type of mechanical waves. Sound waves require medium for its production and propagation Vacuum is defined as the empty space in which there are no matter particles present. As sound is a mechanical wave, in order to propagate material medium is required. Sound cannot travel through vacuum as there is no particles present for vibrations to take place Yes, light travels in a vacuum, and that is what we use as the constant, 3x108ms-1but sound can't, because sound produces waves and pushes the particles in the air. If there are no particles in. In a vacuum, there is no Mechanical Medium and so Nothing to be compressed, so no sound will travel. Because sound, unlike light, needs a medium, usually air. In a vacuum, there is no air. Sounds..

Unlike sound waves, light waves can travel through a vacuum (empty space). They do not need a substance to travel through, but they can travel through transparent and translucent substances The reason light can travel through space is because light has these particles called photons. These so called photons travel through vacuum, and so that is why light can travel through space... Can light travel through a vacuum? Yes. Why can't sound travel through space? Space is a vacuum. Sound cannot travel in a vacuum. What is a vacuum? A vacuum is an empty space. No air or oxygen Unlike electromagnetic waves, they require a medium to propagate. Sound cannot travel through a vacuum. A vacuum is an area without any air, like space. So sound cannot travel through space because there is no matter for the vibrations to work on it

Unlike sound, light does not need a _____ to travel through. medium. Light travels the fastest through the emptiness of a vacuum such as. outer space. Objects that vibrate quickly have a low frequency. False. The inner ear collects sound waves and funnels them into the ear canal How sound waves work and why nothing can be heard in a vacuum. Sound is created through vibration. This is illustrated with reference to a hand bell, a humming bird and buzzing insects. Sound.. Usually one refers to sound as a density wave. Now the reason why some colleges claim that you should think before asking, is due to the fact that the vacuum is defined as state without any.. The Physical Universe (14th Edition) Edit edition. Problem 20E from Chapter 7: Why are light waves able to travel through a vacuum whereas Get solution

### Explain why sound cannot travel through vacuum? - Physics Q&

The solution is radio waves. Radio waves travel perfectly fine through a vacuum because they are a type of electromagnetic wave (light), and electromagnetic waves do not need a medium to travel through. Similarly, we can still see light emitted from the sun even though a vacuum stands between the sun and earth You see lightning before you hear thunder because A) light waves can travel through a vacuum. B) sound waves cannot travel through the air. C) light waves travel faster than sound waves. D) sound waves travel faster than light waves i think its c In none of the cases travel sound in vacuum as sound, rather as some intermediary phenomenon. Except if we consider space as a sparse gas; however the mean free travel length of a hidrogen atom is 600billion light year, so we can't think on it as a practical effect. (Not I was the down.) \$\endgroup\$ - peterh Apr 7 '18 at 21:5 Sound cannot travel in a vacuum as is demonstrated in this clip from Charles Taylor's first 1989 Christmas Lecture.Watch the full first lecture of the series.. Sound cannot travel through a vacuum. A vacuum is an area without any air, like space. So sound cannot travel through space because there is no matter for the vibrations to work on it

### Can light travel through vacuum? - Answer

1. In contrast, light waves can travel through a vacuum, and do not require a medium. In empty space, the wave does not dissipate (grow smaller) no matter how far it travels, because the wave is not interacting with anything else. This is why light from distant stars can travel through space for billions of light-years and still reach us on earth
2. Does sound always need a medium to travel? Can sound travel through vacuum? Find out more in this video. To access all videos Sound, enrol in our full course..
3. 'The reason sound can't travel through a vacuum is that sound needs a medium (solid, liquid or gas with real vibrating molecules) and not because it is a longitudinal wave' How does this make sense as there are particles in space which can vibrate
4. Or to put it another way, sound can't be carried in the empty vacuum of space - there just aren't any molecules for the audio vibrations to move through. Well, that is true: but only up to a point. As it turns out, space isn't a complete and empty void, though large swathes of it are

### Why won't sound travel in a vacuum? - Answer

Light waves are waves in the electromagnetic fields and these fields can exist in space and hence light can travel in space. Whereas, so und waves are the vibration of other particles. Without any other particles present (like in a vacuum), there is nothing for the sound wave to cause to vibrate, so the sound wave can't travel through the vacuum So light can travel through the vacuum of space unimpeded. This is why we can see distant objects like planets, stars, and galaxies. But, we can't hear any sounds they might make. Our ears are what pick up sound waves, and for a variety of reasons, our unprotected ears aren't going to be in space So sound cannot travel through vacuum. 12 ; View Full Answer Vacuum is a space that is empty of matter. Sound is a mechanical energy, and thus requires a material medium for the transfer of its energy. Since there is no material (matter) in a vacuum, sound energy cannot travel through it Try a textbook. Anyway, sound requires some medium to travel through, so the wave can be passed from molecule to molecule. In a vacuum (e.g. space) there is no matter, therefore a sound wave would have no medium through which to travel. Light, on the other hand, can travel perfectly well through a vacuum Sound is made up of vibrations! Hard materials can reflect sound. There are no molecules in a vacuum to conduct the sound waves. because there is no air in the vacuum to carry the sound

### How light travels - Light waves - KS3 Physics Revision

• Let's take the second of those questions first. The speed of light in a vacuum is 299,792.458 km per second - just shy of a nice round 300,000km/s figure. That is pretty nippy. The Sun is 150.
• There are at least two ways that we know light can travel through a vacuum. The first is by observation of the Sun and other stars. Astronauts have measured the pressure in outer space and found that there is a very good vacuum, much better in fact than that which we can easily make on earth. The second is through observations on earth
• Sound waves are only made if the waves go through air. In a vacuum there is no air so there is no sound. There is no sound in space. Light is a special constant that has wave and particle properties. It can travel through anything with the same speed. Einstein's theory of relativity gives an explanation about the unique habits of light and space
• Sound cannot travel through the vacuum of space, but visible light and other forms of electromagnetic radiation can. One of these forms is commonly called radio. The astronauts have devices in their helmets which transfer the sound waves from their voices into radio waves and transmit it to the ground (or other astronauts in space)

### Why can light travel through space, but not sound? What

Sound needs a substance to travel through, like it uses air to travel on earth. Sound can't travel through a vacuum, and that is what space is, a giant vacuum. Light is an electromagnetic wave, which means that it doesn't need a substance to travel through, it can travel through a vacuum As sound is a mechanical wave (unlike light, an electromagnetic wave), it requires a medium in which to travel, therefore, it cannot travel through a vacuum Sound is a mechanical wave. Electromagnetic wave is a by-product of both electric and magnetic field. It does not require presence of any medium and can travel through vacuum. Whereas mechanical waves requires the presence of medium. It works by pushing medium's molecules and traveling through it. Sound works this way Light may seem to be an exception, leading many to say that light is a wave that can travel through a vacuum with no medium. Light doesn't use EM fields as its medium; light IS an EM (electromagnetic) wave. Maxwell's equations tell us that a magnetic field changing in time causes an electric field to change in space, and an electric field.

\$\begingroup\$ Not true. Light travels through vacuum and not sound regardless of wavelength. Similarly through matter light can pass through some materials and not others, and sound passes better through some and worse through others. \$\endgroup\$ - John Alexiou Sep 21 '12 at 14:0 What evidence can you cite to support the idea that light can travel through a vacuum? Light from the sun travels through the vacuum of space. Rank these in order from lowest to highest frequencies: infrared, visible, and ultraviolet light. Sound waves travel much slower than the speed light or any electromagnetic wave

In comparison, sound waves cannot travel through vacuum. Light waves travel at a much higher velocity as compared to sound waves. The velocity of light waves (through a vacuum) is `3 xx 10^8` m/s Sound can leap across a vacuum after all. So it stands to reason that they cannot travel through empty space, where there are no atoms or molecules to vibrate Light vs. Sound - Sound is only a wave, whereas light exhibits both wave and particle properties. - Sound is a longitudinal wave, but light is a transverse wave. - Sound needs a material medium to travel, light can propagate through vacuum also. - Light travels much faster than the sound Light can travel through vaccum. Light is an electromagnetic and transverse wave. The upward movement is known as crest or an elevation is called as crest. of each other while they are on the surface of the moon because there is no air present on the moon and we know that sound cannot travel through vacuum. It needs medium to travel

### Science: Light & Sound Flashcards Quizle

1. Sound waves are part of this type, so they cannot travel through a vacuum. According to these definitions, we can say that the correct choices are the following: Sound must travel through something that vibrates. --> because they are mechanical waves There is no air to vibrate the human eardrum. --> because they are mechanical wave
2. Light Travel Through Different Media. Though the speed of light is constant in vacuum, when traveling through denser media, it slows down considerably. The degree of bending or slowing down of light velocity in different media, is measured by the refractive index of a particular medium
3. Sound cannot travel through a vacuum. because there are no particles to carry the vibrations. Transverse waves In transverse waves , the vibrations are at right angles to the direction of wave travel
4. A Leaving Certificate Physics Demonstration. In space, no one can hear you scream.
5. Sound cannot travel through vacuum. Question 15. Sound: (a) Sound requires a medium to travel (b) does not require a medium to travel (c) sometimes require a medium to travel (d) none of these. Answer (a) Sound requires a medium to travel Sound requires a medium to travel. Question 16. Propagation of sound is fastest In
6. Light doesn't need a medium to travel. The speed of sound through air is about 340 meters per second. It's faster through water and it's even faster through steel. Light will travel through a vacuum at 300 million meters per second. So they're totally different scales. No information can propagate faster than the speed of light
7. g from saturn and its rings(the radiation is mostly from infrared region) is converted to sound via transducers. Thats it. So its NOT sound travelling in vacuum. It is just [part light rays energy converted to.

### How can you show that sound cannot travel through vacuum

• Yes . For example , light is a transverse wave and it travels in vacuum. On the other hand longitudinal wave like sound can not.
• At a particular vacuum, no more sound is heard from the bell, but we can see that the hammer continues hitting the gong and sound is produced. However, the sound is not audible to our ears because of the vacuum inside the jar. This demonstrates that the sound wave cannot travel through vacuum. That is, a sound wave needs a material medium for.
• Step 1 : Introduction to the question Can sound waves travel through a vacuum?...1. No 2. Yes Step 2 : Answer to the question Can sound waves travel through a vacuum? No: Please let us know as comment, if the answer is not correct
• Light waves exist in a vacuum, so why can't sound? You see, these two are different types of energy waves. Sound waves and ocean waves are mechanical ones. Therefore, they need a medium to travel. Ocean waves are caused by energy shifting the water, while sound waves can travel through many mediums, including air and water
• It's the same reason that you can't breathe in space... There are no particles in space... Because of sound waves... Sound is made up of waves. Sound needs a medium to travel in. A vaccum is a void of matter, there is no medium to transmit the wave! sound goes back to the 9t
• Professor Berry Cobb at BGSU demonstrates how to take air our of a chamber to observe whether or not sound can travel without air.After watching, do you thin..
• Through this, we can make a very important observation; Sound waves rely on the medium for propagation. The propagation of the sound wave is not possible through the vacuum. The medium here can be gas, liquid or solid. The speed of sound when it is travelling through a medium depends on the type of medium

You can throw a baseball through the air or in a vacuum without a medium through which it moves, right? Think of the EM field the same way. What is going on is that the presence of an electromagnet field does not require a medium to propagate through since the electric and magnetic fields are what are propagating through the vacuum The speed of sound in a vacuum is zero meters per second, as sound cannot travel in a vacuum. Sound is a wave, which means it spreads through the vibration of particles in a medium, such as water or air. Since a vacuum is empty space, there is no medium for the sound to travel through. The speed of sound in air mainly depends on the temperature.

The spacetime interval of photons is reduced to zero, that means that they do not travel through spacetime, their momentum is transmitted directly from one place to another. The only observable trace they are leaving in spacetime is an electromagnetic wave moving at light speed c vibrating but not be heard? a) ight waves can travel through a vacuum, but sound waves cannot. Sound waves have greater amplitude than light waves. c) Light waves travel slower than sound waves. d) Sound waves have higher frequencies than light waves. 2. The diagram below represents a transverse wave traveling to the right through a medium. Point

Sound cannot travel through a vacuum or in outer space because time is a vibration of matter. Sound can generally travel through any material, including water and steel. Even though sound can travel through many materials, as it travels through insulating materials, much of the sound is absorbed so the individual on the other side of the. If light waves travel through the air at around 299,910 kilometers per second, what will happen to the light waves in the optical fibers? answer choices They will move slower than the light rays in the air, then gain energy from the solid, and then speed up again Their inability to talk directly is not caused by their helmets getting in the way, but is rather caused by the vacuum of space not carrying sound at all. That is why space suits are equipped with two-way radio communicators. Radio is a form of electromagnetic radiation just like light and can therefore travel through the vacuum of space just fine Why would you not include sound waves in the electromagnetic spectrum? (Select all that apply.) Sound waves can only travel through a medium. Sound waves travel much more slowly than light. Sound waves travel at the same speed as light. Sound waves have long wavelengths. Sound waves can only travel through a vacuum

Since sound is a mechanical wave (it needs a substance to travel through) it cannot travel through a vacuum But although sound can travel through Earth, it can't travel from Earth to Mars because there's essentially no matter (gases, liquids, solids) in between the two planets for it to travel through. So it's not strictly true that no sound vibrations can travel through space at all, but it is true that humans would not be able to hear any sounds in.

### Solved: Why Can Light Travel Through Outer Space While Sou

1. Sound waves can not travel through a vacuum (empty space). Electromagnetic Waves - Do not require a physical medium through which to travel. Electromagnetic waves can travel through a vacuum. Examples: Radio waves, visible light, x-rays, etc. When a mechanical wave moves through a physical medium, the particles in the medium oscillate in simple.
2. can travel through outer space. Tags: Question 5 . SURVEY . Sound travels faster than light. Light travels faster than sound. The ears transmit information more slowly than the eyes. Tags: All waves on the electromagnetic spectrum travel at the same speed in a vacuum
3. Light travels as a wave. But unlike sound waves or water waves, it does not need any matter or material to carry its energy along. This means that light can travel through a vacuum?a completely airless space. (Sound, on the other hand, must travel through a solid, a liquid, or a gas.) Nothing travels faster than light energy
4. Mechanical waves move slower than electromagnetic waves with a speed of sound in air is 332 m/s; on the other hand, electromagnetic waves generally travel considerably quicker than the mechanical waves with the speed of light in a vacuum is 3 x l0 8 m/s
5. Sound waves can only travel through a medium if the length of the wave is longer than the average distance between the particles. Physicists call this the mean free path — the average.

### Sound and Light Flashcards Quizle

Sound waves are travelling vibrations of particles in media such as air, water or metal. So it stands to reason that they cannot travel through empty space, where there are no atoms or molecules to vibrate. Hence, Sound cannot travel through vacuum, but it requires a medium electromagnetic waves can travel through the vacuum of space while sound waves cannot. electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present Transverse waves can also travel along the surface tension of the ocean, creating water waves. Light and electromagnetic waves are also transverse waves, however they are self-propagating, meaning that they sustain themselves due to the magnetic field they create, and thus can travel through a vacuum, only slowing down slightly when passing. A sound wave is a mechanical wave that propagates along or through a medium by particle-to-particle interaction. As a mechanical wave, sound requires a medium in order to move from its source to a distant location. Sound cannot travel through a region of space that is void of matter (i.e., a vacuum) Light waves travel much faster than sound waves. Light waves do not need a medium in which to travel but sound waves do. Explain that unlike sound, light waves travel fastest through a vacuum and air, and slower through other materials such as glass or water. (Actual speeds are on the 2nd page

But this is surely does not imply that sound can propagate through a vacuum! Further, light can always propagate through a vacuum, whether classical or quantum, so I would not expect any. ELI5: Sound can not propagate through a vacuum, but why can light? My understanding is that it's because light waves have there own forces that allow them to travel without a medium. But it still doesn't make sense to me When travelling through air, the speed of sound is about 330 metres per second (m/s). Sound cannot travel through a vacuum. because there are no particles to carry the vibrations. The sound. However, pulses of light or sound actually contain a range of wavelengths that all move at different speeds: the group velocity is the speed at which the pulse itself moves. In recent years, it has been shown experimentally that the group velocity of a laser pulse can exceed the speed of light in vacuum — 300,000,000 metres per second — in. The actual molecules themselves don't travel very far, but the disturbances (the regions of changing pressure) can travel for miles. So this means that sound depends on the presence of molecules. Without molecules, there's no such thing as pressure, so there can be no changes in pressure, so no waves. With light, it's different

### How sound waves work and why nothing can be heard in a vacuu

Sound cannot travel through vacuum. In space there is vacuum. Light can travel through vacuum, so we can see the exploding meteor but cannot hear the explosion. Question 10. We can hear the supersonic jet planes flying. How ? Answer: The supersonic jet planes fly in the air. Since sound can travel through air, we can hear then flying Light waves travel in straight lines through empty space (a vacuum), but more interesting things happen to them when they travel through other materials—especially when they move from one material to another. That's not unusual: we do the same thing ourselves. Have you noticed how your body slows down when you try to walk through water Light travels faster than sound because sound waves can only travel as waves of pressure in a medium, whereas electromagnetic waves, of which light is made, move on their own even through vacuum. Light's speed decreases a little when it goes through various mediums, as electromagnetic waves interact with the medium at a subatomic level Sound can travel through air, water, or solids, but it can't travel through a vacuum. It needs the medium to help it travel. Other examples include water waves, seismic waves, and waves traveling through a spring. Electromagnetic waves are waves that can travel through a vacuum (empty space). They don't need a medium or matter. They travel.

### If vacuum state is not truly empty, why sound cannot

1. Unlike light energy, sound cannot travel through a vacuum, because there are no atoms to transmit the vibration. Think of it like a Mexican Wave at a sports stadium. Each person that continues the wave is like an atom passing on the vibration. No people means the Mexican Wave can't keep going - just like no atoms (such as in a vacuum) means.
2. The reason sound typically travels slower than light is because light naturally travels (in a true vacuum) at the fastest possible speed information can travel (light speed). Light (AKA electromagnetic energy) and doesn't require a medium to travel through, while sound must always travel through a medium (traveling at about 332 meters per.
3. Light waves are not considered mechanical waves because they don't involve the motion of matter. Most of the mathematics and properties of mechanical waves apply to light waves. Light waves are different from mechanical waves, however, because they can travel through a vacuum. Light waves are just one type of electromagnetic wave
4. This happens until the sound wave ceases to exist, due to a small amount of energy being lost in each transfer between particles. So, for sound to travel, we need particles. These particles can make up a whole range of things including water, gas, liquids, or even solids. Sound cannot travel through space though, as it is a vacuum

Light and sound both travel as waves. Light can travel through a vacuum whereas sound must travel through a solid, liquid or gas. Both follow the laws of reflection and refraction Heat, light, and sound are all forms of energy. Heat can be transferred by radiation, conduction and con-vection. Visible light can be produced, reflected, refracted, and separated into light of various colors. Sound is created by vibration and cannot travel through a vacuum. Pitch is determined by the vibration rate of the sound source. In order for sound to travel, it must move through some type of matter. In outer space, there are no air particles through which sound can travel. In other words, if there is an explosion in space, it will be silent. You can test this by placing a phone in a vacuum. When music is turned on, no sound will be heard In a vacuum, there is no Mechanical Medium and so Nothing to be compressed, so no sound will travel. Because sound, unlike light, needs a medium, usually air. In a vacuum, there is no air. Sounds cannot trasvel in a vacuum because they have no medium in which they can travel through. Sound travel through matter, trough the interaction of the. Light can travel through a vacuum, but sound cannot travel through a vacuum. Vibrations in light waves are perpendicular to the direction along which the light travels while vibrations of the particles in sound waves are in the same direction as that along which the sound travels. A Sound wave is regarded as Longitudinal waves while light waves.

Why can't light go around corners? And why can sound? Question Date: 2002-12-03: Answer 1: The answer to this question has to do with the fact that both light and sound are made up of waves.However, the waves which make up sound are quite long - each wave is a foot long, about the same length as waves you might see in the water at the beach (the length of a wave is called its wavelength) Sound waves travel through interactions between atoms, which limits their speed. It is about 36 kilometres per second, more than 8000 times lower than the speed of light in a vacuum The standard metric for the speed of light is that of light traveling in vacuum. This constant, known as c , is roughly 186,000 miles per second, or roughly one million times the speed of sound in. Light, in a vacuum, always appears to move at the same speed, the speed of light, regardless of the observer's velocity. or a medium to travel through can we achieve this ultimate cosmic.

### Why are light waves able to travel through a vacuum

1. 1) EM wave is also a particle (from the wave particle duality property). therefore, it can travel in vacuum as if a ball is thrown into open space. 2) EM wave is also a traveling electromagnetic.
2. 1. What can electromagnetic waves travel through that mechanical waves (like sound or earthquakes) cannot travel through? a) air. b) glass. c) water. d) vacuum. e) all of the above 2. What type of electromagnetic waves cause sunburns? a) Radio waves. b) visible light. c) microwaves. d) UV 3
3. Unlike what you might have heard in sci-fi movies, sound does not travel through a vacuum. How can space have sound? Sound travels in waves just like light or heat does, but unlike in those.
4. Sound, like light, also has a spectrum. Humans can only hear sounds of frequencies between 20 Hz and 20,000 Hz. This is tantamount to the visible range of light in the electromagnetic spectrum and is called the acoustic range. Frequencies below 20 Hz are known as infrasounds, while frequencies above 20 kHz are ultrasounds
5. (In air, the waves go ever so slightly slower than in vacuum, and in glass, they can go only about two-thirds as fast as they would in vacuum, but this is not important right now. From now on, when I talk about the speed of light, I mean the speed of light in a vacuum, and I'm talking about waves traveling in a vacuum.
6. In the vacuum of space, there are no (or very, very few) particles to vibrate, so sound cannot travel through this medium. Radio waves travel perfectly fine through a vacuum because they are a type of electromagnetic wave (light), and electromagnetic waves do not need a medium to travel through
7. Considering that sound can't travel through vacuum. In one of the many, many shows that covered scientific inadequecies in Star Wars, it was explained that because the engines used ions, and space is not truly empty, the sound was transmitted through the little gas that was there

A test was shown that sound waves do infact travel in a vacuum. A small device that made sound every few seconds was placed inside of a plastic tube. The ends were capped with the same plexiglass material. A small plastic hose was put into a hole that was drilled into the large tube. The hose was attached to a vacuum We know light can travel through a vacuum because sunlight has to race through the vacuum of space to reach us on Earth. Sound, however, cannot travel through a vacuum: it always has to have something to travel through (known as a medium ), such as air, water , glass , or metal

### Sound in Space? PhysicsCentra

A: Sound can't be carried in the empty vacuum of space because sound waves need a medium to vibrate through such as air or water. Until recently, we thought that since there is no air in space, that no sound could travel and that is still true but only up to a point How can you show that sound cannot travel through a vacuum? Draw a labelled diagram of the apparatus used. Answer: The bell jar experiment is a common experiment to show that sound cannot travel through a vacuum. A bell jar's shape is similar to that of a bell. A bell jar is placed on a base and connected to a vacuum pump as shown in the. The reason why you can't hear a thing in space is because there is no air, and without air there are no waves, which means without air there is no way sound waves can be made. it is like a vortex, as soon as you say something its like it will just evaporate into the emptiness around you In a vacuum, there is no Mechanical Medium and so Nothing to be compressed, so no sound will travel.Because sound, unlike light, needs a medium, usually air. In a vacuum, there is no air.Sounds cannot Travel a vacuum because they have no medium in which they can travel through.Sound travel through matter, trough the interaction of the. For example, there are no water waves without water, and sound does not travel through the vacuum of empty space (so all movies in which you can hear a space ships travel through space are wrong). People therefore assumed that light also needs a medium to travel through, and that medium had to fill the whole Universe (because we can see the.

So, for many years, textbooks told us that phonons cannot travel through a vacuum, said Xiang Zhang, the professor of mechanical engineering at UC Berkeley who guided the study They require a material medium for the propagation as they are mechanical waves. Therefore, sound waves cannot travel through a vacuum. Sound waves propagate through air, liquids, and plasma as longitudinal waves. In solids, on the other hand, sound waves can propagate as both longitudinal waves and transverse waves. Anyhow the speed of sound. Sound needs a substance to travel through, like it uses air to travel on earth Sound can't travel through a vacuum, and that is what space is, a giant vacuum. Light is an electromagnetic wave, which means that it doesn't need a substance to travel through, it can travel through a vacuum

The fact that light does not need a medium means that it can travel full tilt (and its fastest) in a vacuum. It actually can be slowed somewhat (although very slightly) through glass, etc... Sound, on the other hand, cannot travel without a medium, since it depends on a physical vibration Which statement best explains why sound waves cannot travel in space? 1. In space, sound waves are too far away to be heard. 2. Sound waves are transverse waves and cannot travel through a vacuum. 3. Space is a vacuum, and sound waves require a medium to travel. 4 Sound travels in waves like light or heat does, but unlike them, sound travels by making molecules vibrate. So, in order for sound to travel, there has to be something with molecules for it to travel through. On Earth, sound travels to your ears by vibrating air molecules. In deep space, the large empty areas between stars and planets, there.

### You see lightning before you hear thunder because A) light

The speed of sound through air is about 340 meters per second. It's faster through water, and it's even faster through steel. Light will travel through a vacuum at 300 million meters per second. So they're totally different scales Since sound needs particles to carry the vibration, it can't travel through a vacuum. This demonstration shows what happens to the ring of a bell in a jar when the air is pumped out. As the air goes out the sound gets fainter. They can't get all the air out, so you can hear a feeble sound which gets louder as they let the air back in

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