What causes the increase in pitch as an ambulance siren moves toward you?

A. the sound waves spread farther apart
B. the speed of sound waves changes
C. the amplitude of the sound waves changes
D. the sound waves become compressed

Question

What causes the increase in pitch as an ambulance siren moves toward you?

A. the sound waves spread farther apart
B. the speed of sound waves changes
C. the amplitude of the sound waves changes
D. the sound waves become compressed

michele_laino · Answer

I think D, since the observed frequency is increased

anonymous · Answer

ooh okay, makes sense :) thank you!!

michele_laino · Answer

with respect to the emitted frequency

michele_laino · Answer

:)

anonymous · Answer

ahh okie:)