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The wavelength an electromagnetic wave is 27.8 cm in water with n=1.33, find its frequency.

The wavelength an electromagnetic wave is 27.8 cm in water with n=1.33, find its frequency.

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Answer #1

The speed of light in a medium of refractive index n is

where c=3x108m/s is the speed of light in vacuum.

The wavelength , frequency f and velocity v of a wave are related as

Substituting

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