Two sirens situated one kilometer apart are producing sound of frequency $$330$$ Hz. An observer starts moving from one siren to the other with a speed of $$2$$ $$m/s$$. If the speed of sound be $$330$$ $$m/s$$, what will be the beat frequency heard by the observer

Question

Infinity Learn · Accepted Answer

Observer is moving away from siren $$1$$ and towards the siren $$2$$.Hearing frequency of sound emitted by siren $$1n1=nv$$−$$v0v=330$$ $$330$$−$$2330=328HzHearing$$ frequency of sound emitted by siren $$2n2=n$$ $$v+v0v=330$$ $$330+2330=332HzHence$$, beat frequency $$=n2$$−$$n1=332$$−$$328=4$$.

Two sirens situated one kilometer apart are producing sound of frequency 330 Hz. An observer starts moving from one siren to the other with a speed of 2 m/s. If the speed of sound be 330 m/s, what will be the beat frequency heard by the observer

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