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A source of sound S emitting waves of fr...


A source of sound `S` emitting waves of frequency `100 Hz` and an observer `O` are located at some distance from each other. The source is moving with a speed of `19.4ms^-1` at an angle of `60^(@)` with the source observer line as shown in the figure. The observer is at rest. The apparent frequency observed by the observer (velocity of sound in air `330ms^-1`) is

A

`97Hz`

B

`100Hz`

C

`103Hz`

D

`106Hz`

Text Solution

Verified by Experts

The correct Answer is:
C
`n^(1)=(330)/(330-19.4cos60^(@))xx100Hz`
`=(330)/(330-9.7)xx100Hz=103Hz`
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