A tuning fork of frequency \( 340 \mathrm{~Hz} \) is sounded above an organ pipe of length \( 12...

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A tuning fork of frequency \( 340 \mathrm{~Hz} \) is sounded above an organ pipe of length \( 120 \mathrm{~cm} \). Water is now slowly poured in it. The minimum height of water column required for reso nce is (speed of sound in air \( =340 \mathrm{~m} / \mathrm{s} \) )
(a) \( 25 \mathrm{~cm} \)
(b) \( 95 \mathrm{~cm} \)
(c) \( 75 \mathrm{~cm} \)
(d) \( 45 \mathrm{~cm} \)
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