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RAJASTHAN PMT Rajasthan - PMT Solved Paper-1995

  • question_answer
    A car moving with speed \[28m/s\]sound a horn of frequency\[500Hz\], passes another car moving with a speed of \[13m/s\]in same direction, then frequency of horn heard by driver of another car is (speed of sound is \[342m/s\]):

    A)  \[480\,Hz\]

    B)                         \[500\,Hz\]       

    C)         \[520\,Hz\]                       

    D)         \[580\,Hz\]

    Correct Answer: A

    Solution :

      Relative speed of observer and source \[=28-13=15\text{ }m/s\] Apparent frequency                 \[n=n\frac{\upsilon }{\upsilon +{{\upsilon }_{s}}}\]                 \[=500\times \frac{342}{342+15}=480Hz\]     


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