1.

In hydrogen atom, electron makes transition from n=4 to n=1 level. Recoil momentum of the H atom will be [MP PMT 1994]

A.            \[3.4\times {{10}^{-27}}N\text{-}\]sec                         
B.            \[6.8\times {{10}^{-27}}N\text{-}\]sec
C.            \[3.4\times {{10}^{-24}}N\text{-}\]sec                         
D.            \[6.8\times {{10}^{-24}}N\text{-}\]sec
Answer» C.            \[3.4\times {{10}^{-24}}N\text{-}\]sec                         


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