A vessel is placed below a water tap. We can estimate the height of the water level reached in the vessel from a distance simply by listening to the sound. Why?

cbse
waves

#1

The frequency of sound produced in an air column is inversely proportional to the length of the air ; column. As level of water in the vessel increases,
length of air column above it decreases. Hence the frequency of sound produced goes on increasing. The sound becomes shriller.