Two whistles A and B produces notes of frequencies $$660$$ Hz and $$596$$ Hz respectively. There is a listener at the $$mid-point$$ of the line joining them. Now the whistle B and the listener start moving with speed $$30$$ $$m/s$$ away from the whistle A. If speed of sound be $$330$$ $$m/s$$, how many beats will be heard by the listener

Question

Infinity Learn · Accepted Answer

For observer note of B will not change due to zero relative motion.Observed frequency of sound produced by $$A=$$ $$660(330$$−$$30)330=600$$ Hz∴ No. of beats $$=$$ $$600$$ – $$596$$ $$=$$ $$4$$

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