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CMC Medical CMC-Medical Ludhiana Solved Paper-2013

  • question_answer
    The electron in the lowest (n = 1) orbit in hydrogen atom has energy\[-13.6\,eV\]. How much energy is required to ionise a hydrogen atom which is already in the first excited level?

    A)  3.4 eV                 

    B)  10.2 eV

    C)  13.6 eV               

    D)  1.9 eV

    Correct Answer: A

    Solution :

                    lonisgtion energy for hydrogen atom \[E=\frac{13.6}{{{n}^{2}}}\] For first excited level n = 2 \[E=\frac{13.6}{{{2}^{2}}}=3.4\,eV\]


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