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  3. RAJASTHAN ­ PET

RAJASTHAN ­ PET Rajasthan PET Solved Paper-2005

  • question_answer
    A car moving with a speed of 28 m/s and blowing the horn of 500 Hz frequency waves another car moving at 15 m/s. What will be the observed frequency is the dimer of second car? (speed of sound = 332 m/s)

    A)  480 Hz         

    B)  500 Hz

    C)  520 Hz         

    D)  580 Hz

    Correct Answer: A

    Solution :

     \[n'=n\left( \frac{v+{{v}_{0}}}{v+{{v}_{s}}} \right)\] \[=5000\left( \frac{342+13}{342+28} \right)\] \[=\frac{500\times 335}{370}\] \[=480\,Hz\]


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