Question

Problem 12

Answer 1

Given information

As the source and observer move towards (or away from) each other, the Doppler effect causes the frequency of sound, light, or other waves to rise (or decrease). A passing siren's rapid change in pitch, as well as astronomers' redshift, are both caused by this effect.

Step-by-step explanation

Step 1.

A widespread misperception is that there must be a Doppler shift since the cars are traveling. However, there is no relative motion between the two cars in this case. Both vehicles are moving in the same direction and at the same rate.