Question

give the ratios of velocities of light rays of wavelength of 4000A and 8000A

Answer 1

For light or any electromagnetic radiation, the velocity is always $c = 299792458$ meters per second, approximately 3×10⁸ meters per second in vaccuum, and it is not dependent on the wavelength or frequency of the radiation. It only depends on the medium in which the rays travel.

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Answer 2

Since , speed of light is same in vacuum , so Ratio will be 1:1