When is the speed of light constant 299,792,458 meters per second? In air In water In any medium In a vacuum
2 answers:
Answer: In a vacuum
Explanation:
The speed of light in a vacuum is but it is approximated to
, and this value is a constant which has been denoted as
.
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 and will depend on the medium's index of refraction.
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The wavelength of the note is 
. Since the speed of the wave is the speed of sound, 
, the frequency of the note is
Then, we know that the frequency of a vibrating string is related to the tension T of the string and its length L by
where
is the linear mass density of our string.
Using the value of the tension, T=160 N, and the frequency we just found, we can calculate the length of the string, L:
Then, we know that the frequency of a vibrating string is related to the tension T of the string and its length L by
where
Using the value of the tension, T=160 N, and the frequency we just found, we can calculate the length of the string, L: