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Q.

 Air is blown at the mouth of a tube (length 25 cm and diameter 3 cm) closed at one end. Velocity of sound is 330 m,/s. The sound which is produced will correspond to the frequencies

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a

  combination of frequencies 330, 990, 1650, 2310 Hz

b

 combination of frequencies 300, 900, 1500, 2100 Hz

c

 330 Hz

d

 combination of frequencies 390, 660, 880, 1320,1650 Hz

answer is C.

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Detailed Solution

 In case of closed pipe
n1=V4l=3304×0.25=330Hz n2=3V4l=3×3304×0.25=990Hz n3=5n1=1650Hz n4=7n1=2310Hz

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