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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

97 Hz

B

100 Hz

C

103 Hz

D

106 Hz

Text Solution

Verified by Experts

The correct Answer is:
C

`n'=n((v)/(v-v_(s)cos60^(@)))`
`=100((330)/(330-19.4xx(1)/(2)))`
`=100((330)/(330-9.7))`
`=100((330)/(320.3))` ltBrgt =103.02Hz
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