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Luba_88 [7]
3 years ago
14

What is the velocity of all electromagnetic waves in a vacuum?

Physics
1 answer:
Nadya [2.5K]3 years ago
7 0

Answer:

c=3\cdot 10^8 m/s

Explanation:

All electromagnetic waves travel in a vacuum at the same speed, regardless of their frequency. The magnitude of their velocity is

c=3\cdot 10^8 m/s

This value is one of the universal constant and it is called speed of light.

According to Einstein's theory of special relativity, the value of c is the same for all inertial frames (it means that we measure always the same value of c in a vacuum, even if we are moving with respect to the light).

However, the speed of the electromagnetic waves decreases as they move through a medium. In particular, their speed decreases according to the equation:

v=\frac{c}{n}

where n is called index of refraction of the medium.

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