A resonance air column of length $20 cm$ resonates with a tuning fork of frequency $250 Hz$. The speed of sound in air is .... $m/s$
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(b) For closed pipe ${n_1} = \frac{v}{{4l}}$
$\Rightarrow 250 = \frac{v}{{4 \times 0.2}}$$ \Rightarrow v = 200\,m/s$
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