If the velocity sound in air is 336 m / s , the maximum length of a closed pipe that would produce a just audible sound is-

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To produce a just audible sound, the frequency must be the lowest audible frequency, which is $20 Hz$ . For a closed pipe, the fundamental frequency is given by $f = \frac{v}{4 L}$ .

Given $v = 336 m/s$ and $f = 20 Hz$ .

$L = \frac{v}{4 f} = \frac{336}{4 \times 20} = \frac{336}{80} = 4.2 m$ .

Physics - Sound Wave Question with Solution | TestHub

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