An electron of a stationary hydrogen atom passes from the fifth energy level to the ground level. The velocity that the atom acquired as a result of photon emission will be ( 
is the mass of the electron, 
, Rydberg constant and 
Planck’s constant)
Text Solution
Verified by ExpertsThe correct answer is:
A
According to Rydberg formula
Here, 
According to conservation of linear momentum, we get
Momentum of photon 
Momentum of atom
or 
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