A source and an observer are situated on two perpendicular tracks as shown in the figure. The observer is at rest and source is moving with a speed $$50$$ $$m/s$$. The source emits sound waves of frequency $$90$$ Hz which travel in the medium with velocity $$200$$ $$m/s$$. The frequency of sound heard by observer when the source crosses the origin O is

Question

Infinity Learn · Accepted Answer

When source is at origin, the observer receives the sound emitted by the source, when it was at P.           Such thatcosθ $$=50t200t$$ $$=14$$ν' $$=VV-Vcos$$θν  $$=$$ $$200200-50490$$  $$=$$ $$96$$

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