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Q.

At each of two stations A and B, a siren is sounding with a constant frequency of 250 cycle s-1. A cyclist from A proceeds straight towards B with a velocity of 12 km h-1 and hears 5 beats/s. The velocity of sound is nearly:

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a

328 ms-1

b

320 ms-1

c

333 ms-1

d

336 ms-1

answer is C.

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Detailed Solution

If fB is the frequency as heard by cyclist from source B and fA is the frequency as heard by the cyclist from source A. Then fB-fA = 5250(Vs+103Vs)-250(Vs-103Vs) = 5= 333 m/s
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