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Q 41

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Found in: Page 1115

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

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

# Potassium and gold cathodes are used in a photoelectric effect experiment. For each cathode, find: a) The threshold frequency. b) The threshold wavelength. c) The maximum photoelectron ejection speed if the light has a wavelength of 220 nm. d) The stopping potential if the wavelength is 220 nm

a) Threshold frequency of :

Potassium =

Gold =

b) Threshold wavelength of :

Potassium =

Gold =

c) The maximum photoelectron ejection speed of :

Potassium = 3.44 eV

Gold = 0.55 eV

d) Stopping potential of :

Potassium = 3.44 V

Gold = 0.55 V

See the step by step solution

## Step 1. A Potassium and a Gold Cathode is given to us.

We need to find out :

a) The threshold frequency.

b) The threshold wavelength.

c) The maximum photoelectron ejection speed if the light has a wavelength of 220 nm.

d) The stopping potential if the wavelength is 220 nm