A person standing in the street is unaware of a bird dropping that is falling from a point directly above him with increasing velocity. If the dropping were producing sound of a fixed frequency, as it approaches the person would hear the sound
A) drop in frequency.
B) stay at the same frequency.
C) increase in frequency.
D) decrease in loudness.
E) stay at the same loudness.

Question

Quizplus · Accepted Answer

This is due to the Doppler effect, where the frequency of a sound increases for an observer as the source of the sound approaches.

A Person Standing in the Street Is Unaware of a Bird