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MHT CET Physics question

PhysicsDual Nature of Matter and RadiationMHT CET

When certain metal surface is illuminated with a light of wavelength , the stopping potential is . When the same surface is illuminated by light of wavelength , the stopping potential is . The threshold wavelength for the surface is [MHTCET 2019]

Answer: (C)

Solution

and ; subtracting gives , so

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Question ID VK-083706