NEET Sample Paper NEET Sample Test Paper-16

  • question_answer The Bohr's orbit radius for the hydrogen atom (n = 1) is approximately \[0.530\,\overset{\text{o}}{\mathop{A}}\,.\]The radius for the first excited state (n = 2) orbit is

    A)  1.08 A                        

    B)  2.12 A

    C)       5.24 A             

    D)       6.36 A            

    Correct Answer: B

    Solution :

    We know that Bohr's radium \[=\frac{{{\text{(Number}\,\text{of}\,\text{excityed}\,\text{state)}}^{\text{2}}}}{\text{Atomic}\,\text{number}\,\text{of}\,\text{hydrogen}\,\text{atome}}\,\times \,\text{Radius}\,\text{of}\,\text{hydrogen}\,\text{atom}\] \[=\frac{{{(2)}^{2}}}{1\times 0.530}=4\times 0.530=2.120\,\overset{\text{o}}{\mathop{\text{A}}}\,.\] Hence, the correct option is (b).

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