You are in a dark cave; suddenly you hear screeching sounds that are increasing in pitch. From this you discern that something is
A) coming toward you.
B) going away from you.
C) remaining stationary.
D) none of the above.

Question

Quizplus · Accepted Answer

The increasing pitch of the screeching sounds indicates that the source of the sound is coming toward you, due to the Doppler effect, which causes the frequency of sound waves to increase as the source moves closer to the observer.

You Are in a Dark Cave; Suddenly You Hear Screeching