As you drive down the road, you see and hear an ambulance go by you in the
opposite direction. After it passes, how is the frequency you hear different
from that being produced by the ambulance?
O
A. It is higher due to the Doppler effect.
B. It is lower due to the Doppler effect.
O
C. It has not changed, as the two vehicles cancel each othe_out.
O
D. It depends on which vehicle is moving the fastest.​