An air column in a pipe, which is closed at one end, will be in resonance with a vibrating body of frequency $166 \,Hz$, if the length of the air column is .... $m$
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(d) For closed pipe ${n_1} = \frac{v}{{4l}} \Rightarrow l = \frac{v}{{4n}} = \frac{{332}}{{4 \times 166}} = 0.5\,m$
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