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Q.

The wavelengths of two waves are 50 and 51 cm respectively. If the temperature of the room is 20oC, then what will be the number of beats produced per second by these waves, when the speed of sound at 0oC is 332 m/sec

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a

14

b

10

c

24

d

None of these

answer is A.

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Detailed Solution

v0=332 m/s. Velocity sound at t°C is vt=(v0+0.61 t)⇒v20=v0+0.61×20=344.2m/s⇒Δn=v201λ1−1λ2=344.210050−10051=14
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