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

  • question_answer
    A police car moving at 22 m/s, chases a motorcyclist. The policeman sounds his horn at 176 Hz, while both of them move towards a stationary siren of frequency 165 Hz. The speed of the motorcycle, if it is given that he does not observe any beats is

    A)  33 m/s

    B)  22 m/s

    C) zero      

    D) 11 m/s

    Correct Answer: B

    Solution :

    [b] \[176\left( \frac{v-{{v}_{0}}}{v-22} \right)=165\frac{v+{{v}_{0}}}{v}\] Here\[v=330\,m/s\], after simplifying, we get \[{{v}_{0}}=22\,m/s\].


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