Atomic StructureMedium
Question
If a hydrogen atom at rest, emits a photon of wavelength λ, the recoil speed of the atom of mass m is given by :
Options
A.

B.
C.mhλ
D.none of these
Solution
P = const =
photon +
atom = 0
∵ λ =
⇒ v = 
∵ λ =
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