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

  • question_answer
    If the quartz plate is vibrating is 3rd harmonic while measuring the frequency of 1.2 x 106 Hz, then the thickness of the plate is

    A)  71.75 cm                   

    B)  7.175 cm        

    C)  6.02 cm         

    D)  0.07 cm

    Correct Answer: D

    Solution :

     For 3rd harmonic, \[f=3{{f}_{0}}=1.2\times {{10}^{6}}\] \[{{f}_{0}}=\frac{2.87\times {{10}^{4}}}{s}=1.2\times {{10}^{6}}\] or       \[s=0.07175\,\,cm\]


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