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MHT CET 2022 Physics question

PhysicsDual Nature of Matter and RadiationMHT CET 2022

When a certain metal surface is illuminated with light of frequency the stopping potential for the photoelectric current is Vs. When the same surface is illuminated by a light of frequency the stopping potential is . The threshold frequency of photoelectric emission is

Answer: (C)

Solution

Einstein's photoelectric equation: , where is the threshold frequency. Case 1: . Case 2: . Dividing case 1 by case 2: \frac${ν -

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Question ID VK-094383