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Q. In 1 m long open pipe, what is the harmonic of resonance obtained with a tuning fork of frequency $480\, Hz$

Waves

Solution:

For an open organ pipe
$n=n^{\prime} \frac{v}{2 l}$
$n=480\, Hz , \ell=1 m , v =330 m / s$
$n ^{\prime}=\frac{ n (2 \ell)}{ v }$
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$=\frac{480 \times 2 \times 1}{330}$
$=\frac{32}{11} \approx 3$