1. If a fast-moving car making a loud noise approaches and moves past the person, what will happen as the distance between the t
wo increases? A. The pitch of the sound being heard by the person will appear to be lower than the pitch of the source.
B. The pitch and frequency of the sound waves reaching the person's ear will remain unchanged.
C. The frequency of the sound waves reaching the person's ear will be greater than the frequency of the waves leaving the car.
D. The pitch of the sound being heard by the person will appear to be higher than the pitch of the source.
<span>So we want to know what will happen when the fast moving car that is making loud noise that is initially approaching the person, passes the person and starts to move away. So Doppler effect is a phenomenon where when the source of a sound is approaching a person, the person hears the sound as higher than if the source was standing still with respect to the person because the wavelength is getting shorter, and as the source is moving avay from the person the sound is getting deeper because the wavelength is getting longer. So the correct answer is A. </span>
