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Two cars A and B are moving away from ea...

Two cars A and B are moving away from each other in opposite directions. Both the cars are moving with a speed of `20 ms^(-1)` with respect to the ground. If an observer in car A detects a frequency 2000 Hz of the sound coming from car B, what is the natural frequency of the sound source in car B? (Speed of sound in air =`340 ms^(-1)`)

A

2060 Hz

B

2300 Hz

C

2250 Hz

D

2150 Hz

Text Solution

Verified by Experts

The correct Answer is:
C

`f = f_(0) [(v - v_(c))/(v + v_(c))]`
When moving away from each other
`200 = f_(0) [(340 - 20)/(340 20)], f_(0) = 2250 Hz`
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