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MHT CET 2023 Physics question

PhysicsDual Nature of Matter and RadiationMHT CET 2023

When light of wavelength is incident on a photosensitive surface the stopping potential is 'V'. When light of wavelength is incident on same surface the stopping potential is . Then the threshold wavelength for the surface is

Answer: (D)

Solution

Einstein's equation: with . First case: . Second case: . Subtracting: , i.e. $ =

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Question ID VK-097401