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MHT CET 2025 Physics question

PhysicsDual Nature of Matter and RadiationMHT CET 2025

On a photosensitive material, when frequency of incident radiation is increased by 20%, maximum kinetic energy of emitted photoelectrons increases from 0.4 eV to 0.7 eV. The work function of the material is

Answer: (B)

Solution

Einstein's photoelectric equation: . Initially eV. After a increase of frequency, eV. Subtracting: eV, so eV.

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Question ID VK-101148