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A source of sound is moving with a const...

A source of sound is moving with a constant speed of 20 m/s emitting a note of a fixed frequency. The ratio of the frequencies observed by a stationary observer when the source is approaching him and after it has crossed him is (V = 340 m/s)

A

`9 : 8`

B

`8 : 9`

C

`10 : 9`

D

`9 : 10`

Text Solution

Verified by Experts

The correct Answer is:
A
`(n_(1))/(n_(2)) = (v + v_(s))/(v - v_(s)) = (340 + 20)/(340 - 20) = (360)/(320)= (9)/(8)`
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