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Q.

Velocity of sound in air is 320 m/s. A pipe closed at one end has a length of l m. Neglecting the corrections, the air column in the pipe can resonate for sound of frequency

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a

80 Hz

b

240 Hz

c

320 Hz

d

400 Hz

answer is A.

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Detailed Solution

Fundamental frequency:v=3204×1Hz=80HzNow only odd harmonics are present i.e., 80Hz, 80×3=240Hz,80×5=400Hz.
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