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MHT CET 2025 Physics question

PhysicsDual Nature of Matter and RadiationMHT CET 2025

When a photosensitive metal surface is illuminated with radiation of wavelength '', the stopping potential is ''. If the same surface is illuminated with radiation of wavelength '', the stopping potential is . The threshold wavelength for the photosensitive metal surface is

Answer: (C)

Solution

Einstein's equation: . Let . First case: . Second case: . Multiply the second equation by 6: . Subtract the first

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Question ID VK-102183