Physics - Sound Wave Question with Solution | TestHub

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$20.0 \mathrm{cm}$for a tuning fork of frequency$400 \mathrm{Hz}$is used. The velocity of the sound at room temperature is$336{ \mathrm{m} \mathrm{s}}^{-1}$. The third resonance is observed when the air column has a length of _____$\mathrm{cm}$