AIPMT PRELIMS 2009 Physics Photoelectric Current and Potential MCQ Question
The Figure shows a plot of photo current versus anode potential for a photo sensitive surface for three different radiations. Which one of the following is a correct statement?
curves (a) and (b) represent incident radiations of same frequency but of different intensities.
curves (b) and (c) represent incident radiations of different frequencies and different intensities.
curves (b) and (c) represent incident radiations of same frequency having same intensity.
curves (a) and (b) represent incident radiations of different frequencies and different intensities.
Correct Answer
Detailed Explanation
In the photoelectric effect, the photo current is proportional to the intensity of the incident radiation, while the stopping potential is related to the frequency. Curves (a) and (b) having the same stopping potential but different currents indicate the same frequency with different intensities.
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