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JEE Main 2016 Physics question

PhysicsDual Nature of Matter and RadiationJEE Main 2016

Radiation of wavelength λ, is incident on a photocell. The fastest emitted electron has speed v. If the wavelength is changed to , the speed of the fastest emitted electron will be :

Answer: (A)

Solution

and $mv'^2 = - φ =

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Question ID VK-008868