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11      The energy of electron in ground state of hydrogen atom is -13.6 eV. How much energy is required to
                         take an electron in this atom from the ground state to first excited state?





                 12      Define Bohr’s radius.







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                 16      (a)Define distance of closest approach and impact parameter.

                         (b)What are the limitations of Rutherford’s model of an atom?
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