If the velocity of sound in air is 336 m/s. The maximum length of a closed pipe that would produce a just audible sound will be

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3.2 cm

4.2 m

2.2 cm

1.2 m

answer is B.

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Detailed Solution

Minimum audible frequency = 20 Hz. ⇒v4l=20⇒l=3364×20=4.2m