Questions

In a stationary hydrogen atom, an electron jumps from n=2 to n=1, then linear momentum of the atom is

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2.84×10−28kg.m/s

3.48×10−26kg.m/s

5.44×10−27kg.m/s

4.21×10−27kg.m/s

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detailed solution

Correct option is C

Energy of emitted photon =13.61−122ev=10.2ev∴ Momentum of the photon =Ec=102×1.6×10−193×108kg−m/s=5.44×10−27kg−m/sBy conservation of linear momentum, we conclude that momentum of the hydrogen atom =5.44×10−27kg−m/s

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