Physics
Speed of Light

# Is it possible to travel at the speed of light in water?

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The speed of light in water is less than the speed of light in space. Only light can travel at the speed of light.

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## Related Questions The speed of light in water is about 225,400 kilometres per second. No, light does not travel at the same speed in air and water. The speed of light is its speed in vacuo, which is in a vacuum. In other substances, refraction makes light slow down.Speed of light depends upon how dense the medium is. So depending on density of the transparent media, it can slow light to a greater or lesser degree Its speed is increased. Light travel slower in denser medium space, the speed of light is c or exactly 299792458 m/swater, the speed of light is 0.769c or 230540400 m/sdiamond, the speed of light is 0.417c or 125013455 m/s It isn't: the speed of light is the speed of light. However, light does travel slower when passing through matter than it does when light passes through a vacuum. According to the light spectrum, water should travel through a more violet coloured water the fastest. The speed of light through a medium is not governed by its wavelength, so colour is not a factor. The speed of light varies, depending on the medium. It also varies a bit depending on the frequency. The speed of light in different materials is less than the speed of light in empty space. When physicists talk about the speed of light being an absolute limit, they're talking about the speed of light in a vacuum. It's perfectly possible for material objects to travel faster than light in a particular medium ... for example, electrons emitted by radioactive elements (beta rays) often move faster than the speed of light in water. Speed of light in water = speed of light in vacuum/refractive index of water No, light is slowed depending on what medium it travels through. That's why we have the constant ' c ', defined as the speed of light 'in a vacuum'. The actual speed light travels through air, glass, jello, or water, is less than 'c'. The speed of light in water is approx 225,400,000 metres per second. Its speed in kerosene is 215,700,000 metres per seconds. So it travels around 4.5% faster in water. The speed of light is, theoretically, the maximum speed achievable by any particle or the maximum speed which information may be transfered. There are things that we know of that travel faster but are incapable of carrying information. An example is wave guides. There is a book the title of which is "Things that Travel Faster than Light" which explains this more fully However, since light travels at different speeds in different media, it is possible for something to travel faster than the speed of light in, say, water. This produces Cherenkov radiation ... the blue glow you may have seen in pictures of nuclear reactor cores.  Yes, all light travels at the same speed in a vacuum. The speed of light in other media, such as water or glass, is slower than it is in a vacuum. That is the basic principle that makes lenses and prisms work the way they do. In a given medium, however, all electromagnetic waves travel at the same speed. The speed that light travels at depends of the medium in which it travels through. For instance, in a vacuum, light travels at approximately 3x108 meters/second. Mediums such as; air, water, and other materials have different indexes of refraction that cause the light to travel at slower speeds, however 3x108 meters/second is the fastest any light can travel. No. The speed of light in water is slower than the speed in air The speed of light. The speed is the same, if the EM waves travel through empty space. In other media, like air or water, they are usually slower. When light with wavelength of 589 nanometers moves through water at the temperature of 20&deg; C, its speed is 75% of the speed of light in vacuum. Short Answer:Light travels at about 75% its speed in water as it does in air. In air, it is amost the same speed as in a vaccum.Long Answer:The speed of light in air is very nearly the same as its maximum speed in vacuum. In water, the speed of light is three fourths its value in a vacuum.Specifically, the relationship between the speed of light in a material, v, and the speed of light in vacuum, c, is the index of refraction, n.Precisely, n=c/v or in the form we need it, v=c/n.The index of refraction for the vacuum 1.00000, for air at STP, 1.00029 and for waterat 20 C. 1.33.Speed of light in vacuum, v=c.Speed of light in air, v=c/1.00029.Speed of light in water, v=c/1.33. The hydrogen in water causes the speed of light to slow down. When it exits, the air and gravity cause it to speed up again. It gets the energy from gravity. Light can certainly travel slower than its speed in vacuum ... 299,792,458 meters per second.It travels slower than that whenever it's traveling through anything other than vacuum, such as air, water, glass, jello, etc.Light slows when it travels through any material medium. In fact, the speed of light in a medium is equal to the speed of light in a vacuum divided by the index of refraction of the medium. The speed of light Changes a Little depending on what it's travelling through. Its fastest in vacuum and slower in glass or water. The speed of light in air is almost but not quite the same as its speed in vacuum,whereas its speed in water is about 25% less.So when light passes from air into water, its speed drops by about 25% . The light will change directions (to be closer to the normal) once it hits the water. This is known as refraction which is a property of light. In this case, you have 2 media (plural form of medium). The two are air and water. The reason it changes direction is because air allows a different speed of light than water. Water is denser which is why light can't travel as fast. This change in the speed of light is what causes the light to change direction once it hits the water. In conclusion, after light hits the water, it will change directions (to be closer to the normal) due to the fact that the medium is changed(from air to water) which results in a change in the speed of light. The light will change directions (to be closer to the normal) once it hits the water. This is known as refraction which is a property of light. In this case, you have 2 media (plural form of medium). The two are air and water.The reason it changes direction is because air allows a different speed of light than water. Water is denser which is why light can't travel as fast. This change in the speed of light is what causes the light to change direction once it hits the water.In conclusion, after light hits the water, it will change directions (to be closer to the normal) due to the fact that the medium is changed (from air to water) which results in a change in the speed of light. No, light does not speed up in water, it slows down.

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