1.
A student is performing the experiment of Resonance Column. The diameter of the column tube is 4cm4\,\text{cm}. The frequency of the tuning fork is 512Hz512\,\text{Hz}. The air temperature is 38C38^\circ\text{C} in which the speed of sound is 336m/s336\,\text{m/s}. The zero of the meter scale coincides with the top end of the resonance column. When first resonance occurs, the reading of the water level in the column is