NEET Sample Paper NEET Sample Test Paper-14

  • question_answer A pipe of length 1 m is closed at one end. The velocity of sound in air is 300 m/s. The air column in the pipe will not resonate for sound of frequency

    A)  75 Hz.                        

    B)  225 Hz.

    C)  300 Hz.                      

    D)  375 Hz.

    Correct Answer: C

    Solution :

    The tube will resonate for \[\ell =(2n+1)\frac{\lambda }{4},n=0,1,\,2\] Frequency \[=f=\frac{V}{\lambda }=\frac{V(2n+1)}{4\ell }=\frac{300(2n+1)}{4\times 1}\] \[=75\,(2n+1)\] For \[r=300\,Hz,\] the value of\[n=\frac{3}{2},\] which is not an integer Hence, the correction option is [c].

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