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If a hydrogen atom at rest, emits a phot...

If a hydrogen atom at rest, emits a photon of wavelength `lambda`, the recoil speed of the atom of mass m is given by :

A

`h/(mlambda)`

B

`(mh)/lambda`

C

`mhlambda`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
A
From conservation of linear momentum , after emission of a photon , magnitude of linear momentum of the atom=magnitude of linear momentum of photon i.e `mv=h/lambdaRightarrowv=h/(mlambda)`
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