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Q. 6

Expert-verified
Found in: Page 1114

### 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 photoelectric-effect experiment finds a stopping potential of when light of is used to illuminate the cathode.a. From what metal is the cathode made? b. What is the stopping potential if the intensity of the light is doubled?

a. the metal is copper.

b. Stopping potential remains the same.

See the step by step solution

## Part (a) Step 1: Given information

We have given,

stopping potential =

wavelength =

We have to find the metal from which it is made.

## Step 2: Simplify

We can find the metal using the work function of the metal that is found out as,

Then metal is copper.

## Part (b) Step 1: Given information

We have given, the intensity of the light is doubled.

We have to find the stopping potential.

## Step 2: Simplify

Since we already know that the stopping potential doesn't depends on the intensity of light. so if we changing the intensity then it doesn't effect the stopping potential.