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MHT CET 2026 Physics question

PhysicsDual Nature of Matter and RadiationMHT CET 2026

A photoemissive substance is illuminated with a radiation of wavelength so that it releases electrons with de-Broglie wavelength . The longest wavelength of radiation that can emit photoelectron is . Expression for de-Broglie wavelength is (m=mass of electron, h=Planck's constant, C = Speed of light)

Answer: (C)

Solution

Einstein's equation: , so . With de-Broglie wavelength and : $ = hc(Missing argument for \dfrac\dfrac1{λ_i} -

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Question ID VK-099025