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  • Two sources A and B are sounding notes of frequency 680 Hz.A listener moves from A to B with a constant velocity .I

Two sources A and B are sounding notes of frequency 680 Hz.A listener moves from A to B with a constant velocity \mu.If the speed of sound is 340 m/s,what he hears so beats per second?

Option: 1

20 m/s


Option: 2

2.5 m/s


Option: 3

3.0 m/s


Option: 4

3.5 m/s


Answers (1)

best_answer

\mathrm{\begin{aligned} & f_1-f_2=10 \\ & \therefore \quad 680\left(\frac{340+u}{340}\right)-\left(\frac{340-u}{340}\right)(680)=10 \\ & 2(340+u)-\left(\frac{340-u}{340}\right)(680)=10 \\ & u=2.5 \mathrm{~m} / \mathrm{s} . \text { Ar2 } \end{aligned}}

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SANGALDEEP SINGH

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