In one metre long open pipe what is the harmonic of resonance obtained with a tuning fork of frequency $480 Hz$
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(c) In case of open pipe, $n = \frac{N}{{2l}}$
where $N = $ order of harmonics = order of mode of vibration
==>$N = \frac{{n \times 2l}}{v}$
$ = \frac{{480}}{{330}} \times 2 \times 1 = 3$ (Here $v = 330 m/s$)
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