State the zero of the meter scale coincides with the top end

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A student is performing the experiment of resonance column.the diameter of the column tubeis 4 cm.the frequency of the tuning fork is 512Hz..the air temperature is 38C in which speed of sound is 336m/s. The zero of the meter scale coincides with thetop end of resonance column tube.when the first resonance occurs,reading of water level is?

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