Question

When a sound source is moving away from an observer, the observer will hear a lower pitch. This is due to

an increase in the frequency of the sound wave.

a decrease in the amplitude of the sound wave.

an increase in the amplitude of the sound wave.

a decrease in the frequency of the sound wave.

Answer 1

decrease in frequency of sound wave

Answer 2

yeah all because of the doppler effect

Answer 3

the magnitude of the Amplitude in a wave represents the change in volume. it's frequency represents the change in sound. for lower sounds, lower frequencies(like in a bass); for higher sounds- hiegher frequencies (whistle).