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  3. JEE Main & Advanced

JEE Main & Advanced Sample Paper JEE Main Sample Paper-13

  • question_answer
    A source of sound emitting a note of constant frequency is moving towards a stationary listener, and then recedes from the listener with constant velocity maintained throughout the motion. The frequency head by the listener (f) when plotted against time (f) will give one of the following curve(s)

    A)

    B)

    C)                                   

    D)  

    Correct Answer: B

    Solution :

     Form the Doppler effect We know that change in frequencies are as \[2{{H}_{2}}O+2{{e}^{-}}\xrightarrow{\,}\,{{H}_{2}}+2O{{H}^{-}}\] and        \[{{H}_{2}}\]


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