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JEE Main & Advanced Physics Wave Mechanics Question Bank Doppler's Effect

  • question_answer
    A bus is moving with a velocity of 5 m/s towards a huge wall. the driver sounds a horn of frequency 165 Hz. If the speed of sound in air is 355 m/s, the number of beats heard per second by a passenger on the bus will be [KCET 2001; BHU 2002]

    A)            6    

    B)            5

    C)            3    

    D)            4

    Correct Answer: B

    Solution :

               According the concept of sound image \[n'=\frac{v+{{v}_{B}}}{v-{{v}_{B}}}\times n=\frac{355+5}{355-5}\times 165=170\]Hz                    Number of beats \[=n'-\,n=170-165=5\]


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