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MHT CET 2025 Physics question

PhysicsDual Nature of Matter and RadiationMHT CET 2025

Light of wavelength strikes a photoelectric surface and electrons are ejected with energy E. If E is to be increased to twice the original value, the wavelength changes to

Answer: (C)

Solution

By Einstein's equation (with work function ). For double the kinetic energy: . Since , , i.e.

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Question ID VK-100688