Concept explainers
(a) To determine:
Work function of the material.
Answer to Problem 21P
Solution:
Work function of the material is .
Explanation of Solution
Given:
Minimum wavelength,
Formula used:
The work function is calculated by the formula
Here,
is the charge of electron
is the Planck’s constant
is the
is the wavelength
Calculation:
The work function is calculated by the formula
Plugging the values in the above equation
(b) To determine:
Stopping voltage
Answer to Problem 21P
Solution:
The stopping voltage required is .
Explanation of Solution
Given:
Wavelength,
Formula used:
The energy of the photon is calculated as
Here,
is the charge of electron
is the Planck’s constant
is the speed of light
is the wavelength
Calculation:
The energy of the photon is calculated as
Plugging the values in the above equation
Since, the work function of the metal is , so the excess energy of the electron is
Now the stopping voltage required is calculated as
Chapter 27 Solutions
Physics: Principles with Applications
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