Question

Doppler effect causes the pitch of a departing sound from you sound to decrease because the ________.

1) frequency of the sound decreases
2) wavelength of the sound decreases
3) speed of the sound decreases
4) amplitude of the sound decreases

Answer 1

The pitch of a departing sound from you sound decreases because the frequency of the sound decreases.

Step-by-step explanation:

The pitch of a departing sound from you sound decreases because the frequency of the sound decreases due to the Doppler effect. When a sound source moves away from an observer, the waves are stretched out, leading to a decrease in frequency and a decrease in pitch. This phenomenon can be experienced when a train whistle or police siren approaches and then moves away from you.