A) 708 Hz, 8
B) 692 Hz, 8
C) 700 Hz, 0
D) 696 Hz, 4
Correct Answer: A
Solution :
The frequency, of the reflected sound as heard by the driver \[=v'=v\times \frac{v+u}{v-u}=7000\times \frac{350+2}{350-2}=708\,Hz.\] Number of beats heard per second \[=v'-v=708-700=8.\] Hence, the correction option is (a).You need to login to perform this action.
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