Question

which of the following are true about the pitch of sound in relation to the doppler effect?
select all that apply
a as the source of sound waves moves away from a listener, the pitch of the sound gets higher.
b sound waves with a higher frequency produce sound with a higher pitch.
c sound waves with a lower frequency produce sound with a lower pitch.
d as the source of sound waves approaches a listener, the pitch of the sound gets lower.
e the pitch of the sound does not change with the doppler effect.

Explanation:

• Option a: When the source moves away, the frequency decreases (Doppler effect), so pitch gets lower. This option is false.
• Option b: Higher - frequency sound waves correspond to higher - pitched sounds. This is a fundamental relationship in acoustics. This option is true.
• Option c: Lower - frequency sound waves correspond to lower - pitched sounds. This is a fundamental relationship in acoustics. This option is true.
• Option d: When the source approaches, the frequency increases (Doppler effect), so pitch gets higher. This option is false.
• Option e: The Doppler effect specifically causes a change in the perceived frequency (and thus pitch) of sound (or light) waves due to the relative motion between the source and the observer. This option is false.

Answer:

B. Sound waves with a higher frequency produce sound with a higher pitch, C. Sound waves with a lower frequency produce sound with a lower pitch.