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MHT CET 2022 Physics question

PhysicsAtomsMHT CET 2022

An electron in stationary hydrogen atom jumps 4 energy level to ground level. The velocity that the photon acquired as a result of electron transition will be (h = Plank's constant, R = Rydberg's constant, m= mass of photon)

Answer: (B)

Solution

For the transition from to : . The momentum of the photon is . Equating this to

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Question ID VK-094403