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A sound-source is moving in a circle and an observer is outside the circle at \( O \) as shown in
\( \mathrm{P} \) figure. If the frequencies as heard by the listener are \( f_{1}, f_{2} \) and \( f_{3} \) when the source is at \( A, B \) and \( C \) position
W respectively, then:
(1) \( f_{1}=f_{2}f_{3} \)
(2) \( f_{2}f_{3}f_{1} \)
(3) \( f_{1}f_{2}f_{3} \)
(4) \( f_{1}f_{3}f_{2} \)
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