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JEE Main 2022 Physics question

PhysicsDual Nature of Matter and RadiationJEE Main 2022

A metal exposed to light of wavelength 800 nm and emits photoelectrons with a certain kinetic energy. The maximum kinetic energy of photo-electron doubles when light of wavelength 500 nm is used. The workfunction of the metal is : (Take hc = 1230 eV-nm)

Answer: (3)

Solution

= . With 800 nm: , and with 500 nm: $2K = 1230/500 -

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Question ID VK-024760