A police car is moving to the right at X m/s, while a speeder is coming up from behind at a speed X m/s, both speeds being with respect to the ground. The police officer points a radar gun at the oncoming speeder. Assume that the electromagnetic wave emitted by the gun has a frequency of f Hz. Find the magnitude of the difference between the frequency of the emitted wave and the wave that returns to the police car after reflecting from the speeder's car.
The solution provides the fundamentals of Doppler's effect and solve the problems step by step.