A tuning fork of frequency \( 340 \mathrm{~Hz} \) is sounded above ...

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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
\( \mathrm{P} \) slowly poured in it. The minimum height of water

W column required for resonance is (Speed of sound in air \( =340 \mathrm{~m} / \mathrm{s} \) )
(1) \( 25 \mathrm{~cm} \)
(2) \( 95 \mathrm{~cm} \)
(3) \( 75 \mathrm{~cm} \)
(4) \( 45 \mathrm{~cm} \)
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