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Stels [109]
3 years ago
14

All of the following substances are necessary for the survival of living things except —A.foodB.energyC.heliumD.water

Biology
1 answer:
Viktor [21]3 years ago
4 0

Answer:

helium

Explanation:

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Answer:

in a vacuum to the speed of light in the material

Explanation:

<em>The index of refraction, also known as the refractive index, is the ratio of the speed of light in a vacuum to the speed of light in the material.</em>

<u>When light rays travel travels from one medium to another, it bends as a result of a change in the speed of traveling from the first medium to the second medium. </u>

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                    <em>  sin i/sin r</em>

Where i = the incidence angle of the traveling ray in the vacuum and r = angle of refraction.

The refractive index (n) is also given as:

                       <em>  c/v</em>

Where c = velocity of light in the vacuum and v = velocity of light in the material.

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