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

A source od 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 `19.4 ms^-1` at an angle of `60^@` with the source observe line as shwon in the figure. The observer is at rest. The apparent frequency observed by the observer (velocity of sound in air `330 ms^-1` is:

A

`97 Hz`

B

`100 Hz`

C

`103 Hz`

D

`106 Hz`

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