A source of sound \( S \) emitting waves of frequency \( 100 \mathr...

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A source of sound \( S \) emitting waves of frequency \( 100 \mathrm{~Hz} \) and an observer \( O \) are located at some distance from each
\( \mathrm{P} \) other. The source is moving with a speed of \( 19.4 \mathrm{~ms}^{-1} \) at an

W angle of \( 60^{\circ} \) 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 \( 330 \mathrm{~ms}^{-1} \) ) is
[AIPMT 2015]
(a) \( 103 \mathrm{~Hz} \)
(b) \( 106 \mathrm{~Hz} \)
(c) \( 97 \mathrm{~Hz} \)
(d) \( 100 \mathrm{~Hz} \)
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