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Q 41

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 1115

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Short Answer

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 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

Step 2. Part a) For Threshold Frequency

Step 3. Part b) For threshold Wavelength

Step 4. Part c) For maximum Kinetic energy of ejected electrons

Step 5. Part d) Applying the Law of conservation of Energy.

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