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  4. 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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Q. 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

ManipalManipal 2011

Solution:

Velocity of sound in air $v=336\, m / s$.
As we are quite well know that the lowest frequency of audible sound is $20\, Hz$.
Hence maximum length of a closed pipe to produce just audible sound is given by
$l =\frac{336}{4 \times v}=\frac{336}{4 \times 20}$
$=4.2\, m$