Question

to a listener, the doppler effect is perceived as a change in the ______ of sound.

Explanation:

The Doppler effect is a phenomenon in physics. When there is relative motion between a sound source and a listener, the frequency of the sound waves changes. Frequency is related to the pitch of the sound. For example, when an ambulance is approaching, the pitch (due to higher - perceived frequency) is higher, and when it moves away, the pitch (due to lower - perceived frequency) is lower.

Answer:

pitch