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  3. BHU PMT

BHU PMT BHU PMT Solved Paper-2003

  • question_answer
    Ratio of radii of second and first Bohr orbits of H atom is:

    A)  2 : 1                                      

    B)  4 : 1

    C)  3 : 1                                      

    D)  5 : 1

    Correct Answer: B

    Solution :

                     According to Bohr's rule \[r\propto {{n}^{2}}\] where   r = radii of orbit n = number of orbit. \[\therefore \]  \[\frac{{{r}_{1}}}{{{r}_{2}}}=\frac{n_{2}^{2}}{n_{1}^{2}}=\frac{{{(2)}^{2}}}{{{(1)}^{2}}}=\frac{4}{1}\] \[\therefore \]Ratio of second and first orbit of H is 4:1


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