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JEE Main & Advanced Sample Paper JEE Main Sample Paper-39

  • question_answer
    The source of sound generating a frequency of 3 kHz reaches an observer with a speed of 0.5 times in air. The frequency heard by the observer is

    A)  1 kHz                         

    B)  2 kHz

    C)  4 kHz                         

    D)  6 kHz

    Correct Answer: D

    Solution :

     According to Doppler's effect \[f=\left( \frac{v\pm {{v}_{0}}}{v\pm {{v}_{s}}} \right)f\]here\[{{\upsilon }_{0}}=0\]and \[{{\upsilon }_{s}}=0.5\upsilon \] \[\therefore \]\[f=\left( \frac{v}{v-.5v} \right)3=6kHz\]


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