Concept explainers
(a)
The stopping potential of incident light.
(a)

Answer to Problem 74P
The stopping potential of incident light is
Explanation of Solution
Write the expression to find the maximum kinetic energy.
Here,
Write the expression for Einstein’s photoelectric equation.
Here,
Equate equations (I) and (II) to find the work function for sodium.
Re-arrange the expression to find the work function for sodium.
Substitute
Re-arrange the equation (III) to find the stopping potential.
Conclusion:
Substitute
(b)
The stopping potential for the incident light when the intensity is
(b)

Answer to Problem 74P
The stopping potential for the incident light when the intensity
Explanation of Solution
Write the equation to find the stopping potential.
The stopping potential of incident light is independent on intensity of light as in the above expression. Thus, the stopping potential of light cannot be changed when the intensity of the light is increased from
Conclusion:
The stopping potential of the incident light is
(c)
Work function if the sodium.
(c)

Answer to Problem 74P
Work function if the sodium is
Explanation of Solution
Write the expression to find the maximum kinetic energy.
Here,
Write the expression for Einstein’s photoelectric equation.
Here,
Equate equations (I) and (II) to find the work function for sodium.
Re-arrange the expression to find the work function for sodium.
Conclusion:
Substitute
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Chapter 27 Solutions
PHYSICS
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