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MHT CET Physics question

PhysicsDual Nature of Matter and RadiationMHT CET

A certain metallic surface is illuminated with monochromatic light of wavelength . The stopping potential for photoelectric current for this light is . If the same surface is illuminated with light of wavelength , the stopping potential is . The threshold wavelength for this surface for photoelectric effect is

Answer: (B)

Solution

and ; subtracting gives , so and

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Question ID VK-083682