Q:

What is the speed of light in water?

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Quick Answer

The speed of light in water is approximately 225,000 km per second. While enormously fast, this is notably slower than the speed of light in a vacuum, which is 300,000 km per second.

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What is the speed of light in water?
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Full Answer

The degree that light slows down when passing through a medium is described by the index of refraction of that medium. This index measures how much the medium alters the course that the light travels through reflection, refraction, occlusion or other obstruction. Calculating the speed of light in the medium requires dividing the speed of light by the index of refraction. This results in the equation v = c / n, where v is the speed that light travels in the medium, c is the speed of light in a vacuum and n is the index of refraction.

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Related Questions

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    What causes light refraction?

    A:

    Refraction is caused by light passing from one medium to another (from air to water, for example) and experiencing a change in speed. A fisherman looking into water to spear a fish will have to remember that refraction will distort the image he sees under the water's surface.

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  • Q:

    What is the speed of radio waves?

    A:

    The speed of radio waves is approximately 185 miles per second, which is also the speed of light. The reason that radio waves travel at the speed of light is that they are a type of electromagnetic radiation. Other forms of electromagnetic radiation are X-rays and light.

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    How fast do radio waves travel?

    A:

    Radio waves travel at a velocity that is equal to the speed of light traveling in a vacuum, which is 186,282 miles per second. Top speed is only possible in empty space; passing through transparent liquids and solids like crystals cause waves to bend, which slows down their speed.

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  • Q:

    What is the index of refraction?

    A:

    The index of refraction of any material is the speed of light in a vacuum divided by the speed divided by the speed of light in the medium. It is denoted with the letter "n."

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