Resonance Column :-
The velocity with which sound travels in any medium may be determined if the frequency and the wavelength are known. The relationship between these quantities is:
v = fλ where v = velocity of sound propagation
f = frequency
λ = wavelength
The wavelength of the sound will be determined by making use of the resonance of an air column. The apparatus for the experiment consists of a long cylindrical tube attached to a water reservoir. The length of the water column may be changed by raising or lowering the water level while the tuning fork is held over the open end of the tube. Resonance is indicated by the sudden increase in the intensity of the sound when the column is adjusted to the proper length.
This video explains how to find the velocity of sound in air at room temperature and at 0°C using the resonance column by determining two resonance positions.