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A student is performing the experiment of resonance column. The diameter of the column tube is 6m. The frequency of the tuning fork is 504Hz. Speed of the sound at the given temperature is 336m/s. The zero of the meter scale coincides with the top end of the resonance tube. The reading of the water level in the column when first resonance occurs is:
A) 13cm
B) 14.8cm
C) 16.6cm
D) 18.4cm

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