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A helium-neon laser beam has a wavelength in air of 633 nm. It takes 1.48ns for the light to travel through 29.0cm of an unknown liquid.
What is the wavelength of the laser beam in the liquid?
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Velocity of light in unknown liquid = (0.29/(1.48*10^-9))

= 0.196*10^9 m/sec

As we know that Frequency remains same

and velocity = frequency*wavelegth

Therefore

Velocity/Wavelength = Constant

Therefore

(3*10^8)/(633) = (0.196*10^9)/lambda

lambda = 413.56 nm
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