Home/ Questions/Q 412969
Next
In Process
Sara Rama
Asked: 2022-10-29T17:04:21+05:30 In:

A police car with a siren of frequency `8 KHz` is moving with uniform velocity `36 Km//hr` towards a ball building which reflects the sound waves. The speed of sound in air is `320 m//s`. The frequency of the siren heard by the car driver is
A. 8.25 kHz
B. 8.50 kHz
C. 7.75 kHz
D. 7.50 kHz

A police car with a siren of frequency `8 KHz` is moving with uniform velocity `36 Km//hr` towards a ball building which reflects the sound waves. The speed of sound in air is `320 m//s`. The frequency of the siren heard by the car driver is
A. 8.25 kHz
B. 8.50 kHz
C. 7.75 kHz
D. 7.50 kHz
Parabola
Leave an answer

Leave an answer

Browse

1 Answer

  1. Correct Answer – B
    `n_(“inicident”) = n_(“reflected”) = (320)/(320 – 10) xx 8 kHz`
    `n_(“observed”) = (320 + 10)/(320) n_(“reflected”)`
    `= 8 xx (330)/(310) = 8.51 kHz = 8.5 kHz`

    • 0