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CMC Medical CMC-Medical VELLORE Solved Paper-2015

  • question_answer
    A boy is going away from noise producing centre on his motorbike speeding 36 km/h listening the noise. If the main frequency is of 600 Hz and a wind is blowing along the direction motion of motorbike at 36 km/h then the main frequency beared by boy is (in Hz) (speed of sound in still air is 340 m/s)

    A)  589                       

    B)  586   

    C)  585                       

    D)  590

    E)  583

    Correct Answer: E

    Solution :

                    The source is moving with respect to wind at a speed of 36 km/h, i.e. 10 m/s, As the source is going away from observer who is at rest with respect to the medium, the frequency heard by the boy is\[v=\frac{v}{v+{{u}_{s}}}v=\frac{340}{340+10}\times 600\,Hz\] \[=583\,Hz\]


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