Question

An empty earthen pitcher is kept under a water tap and starts filling with water as the tap is opened. The pitch of the sound produced

• A. goes on decreasing.
• B. goes on increasing.
• C. first increases and then decreases after the pitcher is half filled.
• D. does not change.

Answer 1

The correct option is A goes on decreasing.

As the bottle fills up, the air column or amount of air inside the bottle decreases. So as a result, the pitch or shrillness of the sound will increase, as frequency or pitch of sound is inversely proportional to the length of vibrating air column. Also the amplitude or the loudness of the sound will decrease, as the amount of the air column vibrating decreases as the bottle fills up. So with the increase in shrillness of the sound, you can detect the filling up of the bottle. So the more the shrillness, the more the bottle has been filled. N.B. When the bottle overflows, the shrill sound will be heard no more