Question

When is the speed of light constant 299,792,458 meters per second? In air In water In any medium In a vacuum

Answer 1

In a vacuum

Step-by-step explanation:

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Answer 2

Answer: In a vacuum

Step-by-step explanation:

The speed of light in a vacuum is
`299,792,458 m s` but it is approximated to
`3(10)^(8) m/s`, and this value is a constant which has been denoted as
`c`.

However, in other media different from vacuum, the speed of light will depend on its molecular structure, specifically on its electromagnetic properties, its electrical permittivity and magnetic permeability.

In addition, it is important to note that in these materials or media different from vacuum, the speed of light will be less than
`c` and will depend on the medium's index of refraction.