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JEE Main & Advanced Physics Wave Mechanics Question Bank Graphical Questions

  • question_answer
    An observer starts moving with uniform acceleration a toward a stationary sound source emitting a whistle of frequency n. As the observer approaches source, the apparent frequency, heard by the observer varies with time as                   

    A)                                   

    B)                           

    C)                                   

    D)                           

    Correct Answer: B

    Solution :

                       For observer approaching a stationary source                    \[{n}'=\frac{v+{{v}_{0}}}{v}.n\]and given \[{{v}_{0}}=at\]Þ\[{n}'=\left( \frac{an}{v} \right)\ t+n\]            this is the equation of straight line with positive intercept n and positive slope \[\left( \frac{n}{v} \right)\].


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