Repeatedly tap the side of a drinking glass with a spoon as you fill the glass with water and the pitch of the sound
A)increases.
B)decreases.
C)remains relatively constant.

Question

Quizplus · Accepted Answer

As you fill the glass with water, the amount of space available for the air to vibrate decreases, which lowers the frequency of the sound waves produced by tapping the glass. Lower frequency sounds have a lower pitch, hence the pitch decreases.

Repeatedly Tap the Side of a Drinking Glass with a Spoon