Question

standing at a distance how is it possible to detect the filling of a bucket under a water tap by hearing the sound?
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Answer 1

Answer:

As the bottle fills up, the air column or amount of air inside the bottle decreases. ... 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