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J & K CET Medical J & K - CET Medical Solved Paper-2008

  • question_answer
    First Bohr radius of an atom with Z = 82 is R. Radius of its third orbit is

    A)  9 R                                        

    B)  6 R

    C)  3 R                                        

    D)  R

    Correct Answer: A

    Solution :

                     Radius of Bohrs orbit. \[{{R}_{n}}=\frac{{{A}_{0}}{{n}^{2}}}{Z}\] \[\Rightarrow \]               \[{{R}_{n}}\propto {{n}^{2}}\]           (Z = constant) \[\therefore \]  \[{{R}_{3}}={{3}^{2}}R=9R\]


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