A stationary hydrogen atom emits a photon corresponding to first line of the Lyman series. What velocity does the atom acquire?

A stationary hydrogen atom emits a photon corresponding to first line

1.	A stationary hydrogen atom emits a photon corresponding to first line of the Lyman series. What velocity does the atom acquire?
Answer» Correct Answer - `(E)/(c ).(1)/(m)=(13.6xx3e)/(4cm_(p))=3.25m//s` Energy of the first line in Lyman series `E=13.6xx(1-(1)/(4))eV=10.2 eV` Velocity of atoms `=(p)/(m)=(E)/(c ).(1)/(m)=(10.2xx1.6xx10^(-19))/(3xx10^(8)xx1.67xx10^(-24))m//s=3.25 m//s`

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A stationary hydrogen atom emits a photon corresponding to first line of the Lyman series. What velocity does the atom acquire?

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