An air column, closed at one end and open at the other, resonates with a tuning fork when the smallest length of the column is $50\, cm.$ The next larger length of the column resonating with the same tuning fork is .... $cm$
NEET 2016, Medium
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From figure,
First harmonic is obtained at
$l=\frac{\lambda}{4}=50 \mathrm{cm}$
Third harmonic is obtained for resonance,
$l^{\prime}=\frac{3 \lambda}{4}=3 \times 50=150 \mathrm{cm}$
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