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 stationar
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`
4 views
1 Answers
Correct Answer - A
`(n_(1))/(n_(2)) = (v + v_(s))/(v - v_(s)) = (340 + 20)/(340 - 20) = (360)/(320)= (9)/(8)`
4 views
Answered