speed= distance/time=.31m/1.48E-9sec
wavelength is prop to speed.
wavelength=633nm*speedabove/speedinair
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?
Express your answer with the appropriate units.
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