Question 18
(18) An ambulance moves through a street along the positive X direction and a person who stands beside the street hears the sound of the ambulance siren. Which option represents the frequency (f) received by the person? X is the position of the ambulance; the person stands at the origin. [1 mark]
A. Graph A in the original figure
B. Graph B in the original figure
C. Graph C in the original figure
D. Graph D in the original figure
A. Graph A in the original figure
B. Graph B in the original figure
C. Graph C in the original figure
D. Graph D in the original figure