Which of the following options represent the variation of photoelectric current with property of light shown on the x-axis? Choose the correct answer from the options given below:
A
A only
B
A and C
C
A and D
D
B and D
The answer is A.
Solution
Photoelectric current is directly proportional to the intensity of incident radiation for frequency above threshold, represented by graph A only.
The number of photoelectrons emitted per second (and hence saturation photoelectric current) is directly proportional to the intensity of the incident light (provided $\nu > \nu_0$). Thus, a plot of photoelectric current against intensity is a straight line passing through the origin (Graph A). Photoelectric current does not vary linearly with frequency above threshold (stopping potential does), so C and D are incorrect representations.
ConceptPhotoelectric Current vs Intensity
Dual Nature of Radiation and Matter in past papers
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