a) What do you hear? b) What difference do you notice in the sound produced?

Question

Observing the changes in sound: Take 4 or 5 metal glass bowls or tumblers. Fill them with water in decreasing order. Strike gently each bowl or tumbler with a spoon.

a) What do you hear?

b) What difference do you notice in the sound produced?

c) Why is there variation in the sound produced due to change in the water level of a bowl?

Answer 1

a) We can hear a musical sound. This is a jalatarang. 

Fill the bowls or tumblers with equal amounts of water, strike each ball like in above case and listen the sound.

b) It does not produce musical note in this case.

c) The change is due to change in air columns. That is sounds are produced by the vibrating bodies and air passes through orifices of the instrument.