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Q.

Two closed pipe produce 10 beats per second when emitting their fundamental nodes. If their length are in ratio of 25 : 26. Then their fundamental frequency in Hz, are

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a

270, 280

b

260, 270

c

260, 250

d

260, 280

answer is C.

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Detailed Solution

n1−n2=10                   ..…(i) Using n1=v4l1 and  n2=v4l2⇒n1n2=l2l1=2625         …..(ii)After solving these equation n1=260 Hz,  n2=250 Hz
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