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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 show in the figure. The observer is at rest . The apparent frequency observed by the observer in air is `330 ms^(-1)` , is

A

97 Hz

B

100 Hz

C

103 Hz

D

106 Hz

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The correct Answer is:
C
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