Photoelectric Experiment: Intensity, Stopping Potential & Graphs
The figure shows the variation of photocurrent with anode potential for four different radiations. Let and be the intensities for the curves and respectively and are frequencies respectively]

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Answer: (c)
- All four curves meet the axis at the same retarding potential, so the frequencies are equal: .
- Saturation currents rise from to , and saturation current intensity: .
- So the answer is (c).