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how to calculate speed of light in air. The speed of light formula is c c nl where n is the light frequency and l is the wavelength. The speed of sound in undisturbed air is a function only of temperature and not altitude as is often mistakenly assumed.
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C the speed of light 300000 kms or 30 x 10 8 ms. The refractive index of air for visible light is about 10003 so the speed of light in air is about 90 kms 56 mis slower than c. The refractive index of a material is a measure of the change in the speed of light as it passes from a vacuum or air as an approximation into the material.
Given speed of light in air 3 xx 108 ms.
The Mach number is the ratio of the True Airspeed to the sonic speed. For example for visible light the refractive index of glass is typically around 15 meaning that light in glass travels at c 15 200 000 kms 124 000 mis. The wavelength of light usually measured in meters or Angstroems 1 A 10 -10 m. Nfrac v_ 1 v_ 2 In the.
