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Question

An atom of mass M which is in the state of rest, emits a photon of wavelength λ . As a result atom will deflect with the kinetic energy equation to (h is planck's constant).

A
h2Mλ2
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B
12h2Mλ2
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C
hMλ
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D
12hMλ
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Solution

The correct option is B 12h2Mλ2
Momentum of photon, p=hλ
Kinetic energy of photon of mass M, K=P22Mλ
or K=h22Mλ2.

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