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CMC Medical CMC-Medical VELLORE Solved Paper-2010

  • question_answer
    A sounding source of frequency 500 Hz moves towards a stationary observer with a velocity 30 m/s. If the velocity of sound in air is 330 m/s, find the frequency heard by the observer.

    A)  500 Hz                                 

    B)  550 Hz

    C)  355 Hz                                 

    D)  55.5 Hz

    E)  None of these

    Correct Answer: B

    Solution :

                    Hence, \[n=500\,Hz,\]\[{{v}_{0}}=0,\] \[{{v}_{s}}=30\,m\text{/}s,\]\[v=330\,m\text{/}s\] \[\therefore \] From, \[n=n\left( \frac{v-{{v}_{0}}}{v-{{v}_{s}}} \right)\]                 \[=500\left( \frac{330}{330-30} \right)\]                 \[=500\,Hz\]


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