# Physics

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Problem 17.6

A helium-neon laser beam has a wavelength in air of 633nm . It takes 1.48 ns for the light to travel through 31.0 cm of an unknown liquid.

Part A -

What is the wavelength of the laser beam in the liquid?

• Physics -

speed= distance/time=.31m/1.48E-9sec

wavelength is prop to speed.
wavelength=633nm*speedabove/speedinair

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