NEET Sample Paper NEET Sample Test Paper-39

  • question_answer 39) Two sources of sound placed close to each other are emitting progressive waves given by \[{{y}_{1}}=4\,\sin 600\,\pi t\]and \[{{y}_{2}}=5\,\sin 608\,\pi t.\]An observer located near these two sources of sound will hear:

    A)  4 beats per second with intensity ratio 81:1 between waxing and waning

    B)  4 beats per second with intensity ratio 25 : 16 between waxing and waning

    C)  8 beats per second with intensity ratio 25 : 16 between waxing and waning

    D)  8 beats per second with intensity ratio 81: 1 between waxing and waning

    Correct Answer: A

    Solution :

     \[\frac{{{I}_{1}}}{{{I}_{2}}}=\frac{({{A}_{1}}+{{A}_{2}})}{({{A}_{1}}-{{A}_{2}})}=\frac{81}{1}\] Beat frequency = 304 - 300 = 4 Hz.

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