Q. 50

Expert-verified
Found in: Page 453

### Physics for Scientists and Engineers: A Strategic Approach with Modern Physics

Book edition 4th
Author(s) Randall D. Knight
Pages 1240 pages
ISBN 9780133942651

# A helium-neon laser beam has a wavelength in air of 633 nm. It takes 1.38 ns for the light to travel through 30 cm of an unknown liquid. What is the wavelength of the laser beam in the liquid?

The wavelength of the laser beam through the unknown liquid is,

See the step by step solution

## Step 1: Given data

Helium-neon laser beam has a wavelength in air of

For an unknown liquid, the beam takes a time of

Distance travelled through the liquid,

## Step 2: Determination of refractive index

Speed of the beam through the unknown liquid can be determined as,

Now, the refractive index of the liquid can be obtained by,

## Step 3: Finding the wavelength

The wavelength of the beam through the liquid is,