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NEET Sample Paper NEET Sample Test Paper-21

  • question_answer
    A stationary hydrogen atom emits a photon corresponding to the first line of Lymen series. If R is the Rydberg's constant, what velocity does the atom acquire if its mass is M

    A) \[\frac{3Rh}{4\,M}\]              

    B)    \[\frac{Rh}{4\,M}\]   

    C)   \[\frac{Rh}{2\,M}\]                

    D)   \[\frac{Rh}{\,M}\] 

    Correct Answer: A

    Solution :

    From conservation of momentum \[MV=\frac{h}{\lambda }=hR\left( 1-\frac{1}{4} \right)\,\therefore \,V=\frac{3}{4}\,\frac{hR}{M}\] Hence, the correction option is (a).


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