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JEE Main & Advanced Physics Wave Mechanics Question Bank Self Evaluation Test - Waves

  • question_answer
    A speeding motorcyclist sees trafic jam ahead of him. He slows down to 36 km/hour. He finds that traffic has eased and a car moving ahead of him at 18 km/hour is honking at a frequency of 1392 Hz. If the speeds of sound is 343 m/s, the frequency of the honk as heard by him will be :

    A)  1332 Hz

    B)  1372 Hz

    C) 1412Hz

    D) 1464Hz

    Correct Answer: C

    Solution :

    [c] According to Doppler's effect Apparent frequency \[n'=n\left( \frac{v+{{v}_{0}}}{v+{{v}_{s}}} \right)=1392\left( \frac{343+10}{343+5} \right)\] \[=1412\,Hz\]


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