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AFMC AFMC Solved Paper-2002

  • question_answer
    In a sinusoidal wave, the time required for a particular point to move from maximum displacement is 0.17 s. Then the frequency of the wave will be :

    A) 1.47 Hz 

    B) 2.94 Hz

    C) 4.17 Hz                                 

    D) 0.92 Hz

    Correct Answer: A

    Solution :

    Key Idea: Frequency is reciprocal of time period. For a sinusoidal wave, time period is                       \[T=4t\] Time required for maximum displacement is       \[T=4\times 0.17\] Also frequency is inverse of time period, hence, \[n=\frac{1}{T}=\frac{1}{0.68}=1.47\,Hz.\]                         


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