JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2009

  • question_answer
        An electron makes transition inside a hydrogen atom. The orbital angular momentum of the electron may change by

    A)  \[h\]                                    

    B)  \[\frac{h}{3\pi }\]

    C)  \[\frac{h}{2\pi }\]                                           

    D)  \[\frac{h}{4\pi }\]

    Correct Answer: C

    Solution :

                    Let electron jump from \[{{n}_{1}}\to {{n}_{2}}\] So,       \[\Delta L=({{n}_{2}}-{{n}_{1}})\frac{h}{2\pi }\] (According to Bohrs quantitation rule) Since,\[{{n}_{1}}\]and\[{{n}_{2}}\]are integers\[({{n}_{1}},{{n}_{2}}>1),\]so \[{{n}_{2}}-{{n}_{1}}\] is also an integral value and hence,\[\Delta L\]must be an integral multiple of\[\frac{h}{2\pi }\].


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