Suppose you are doing a popular demonstration where you fill many identical pop bottles up with different water levels and then get the system to make sound by either tapping on the side of the bottle or blowing across the top of it. The results of the demonstration will be that
A) Both types of pitches will increase with increasing water level.
B) The tapping pitch will decrease while the blowing pitch will increase with increasing water level.
C) The tapping pitch will increase while the blowing pitch will decrease with increasing water level.
D) Both types of pitches will decrease with increasing water level.

Question

Quizplus · Accepted Answer

When tapping on the side of the bottle, the pitch decreases with increasing water level because the amount of air that can vibrate inside the bottle decreases, lowering the frequency of the sound produced. Conversely, when blowing across the top, the pitch increases with increasing water level because the length of the air column that can vibrate decreases, raising the frequency of the sound produced.

Suppose You Are Doing a Popular Demonstration Where You Fill