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In an experiment to determine the veloci...

In an experiment to determine the velocity of sound in air at room temperature using a resonance tube, the first resonance is observed when the air column has a length of 20.0 cm for a tuning fork of frequency 400Hz is used. The velocity of the sound at room temperature is `336 ms^(-1)`. The third resonance is observed when the air column has a length of ___cm

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