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JIPMER Jipmer Medical Solved Paper-2014

  • question_answer
    A sound source producing waves of frequency 300 Hz and wavelength 1 m observer is stationary, while source is going away with the velocity 30 m/s, then apparent frequency heared by the observer is

    A)  270 Hz                 

    B)         273 Hz

    C)  383 Hz                 

    D)         300 Hz

    Correct Answer: B

    Solution :

    Apparent frequency, when source is moving and observer is stationary \[n=n\left( \frac{V}{V+{{V}_{s}}} \right)\]                 \[n=300\,\left( \frac{330}{330+30} \right)\]                     \[=300\left( \frac{330}{360} \right)=300\times 0.91\]                     \[=273\,Hz.\]


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