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NEET Sample Paper NEET Sample Test Paper-60

  • question_answer
     If \=100cm, \=90 cm and velocity of sound = 396m/s. The number of beats (in Hz) are:

    A) 4                     

    B) 2     

    C) 3                     

    D) 44

    Correct Answer: D

    Solution :

    [d] Frequency \[({{f}_{1}})=\frac{v}{\lambda }=\frac{396}{{}^{100}/{}_{100}}=396Hz\]             \[{{f}_{2}}=\frac{396}{90\times {{10}^{-2}}}=440Hz\]             No. of beats =\[{{f}_{2}}-{{f}_{1}}\]             \[=440-396=44Hz\]


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