JEE Main & Advanced Sample Paper JEE Main Sample Paper-45

  • question_answer
    If the thickness of the plate is 0.5 cm, then quartz plate can't be used to control frequency of

    A)  \[3.62\times {{10}^{4}}\,Hz\]        

    B)  \[5.74\times {{10}^{4}}Hz\]

    C)  \[28.7\times {{10}^{4}}Hz\]          

    D)  None of these

    Correct Answer: B

    Solution :

     For \[s=0.5\,\,cm\] \[{{f}_{0}}=\frac{2.87\times {{10}^{4}}}{0.5}=5.74\times {{10}^{4}}\,Hz\] So, the plate can vibrate with frequencies \[{{f}_{0}},\,\,2{{f}_{0}},...,\] only.

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