A Minivan Moving at 38 M/s Passes an Unmarked State

A minivan moving at 38 m/s passes an unmarked state police car moving at 24 m/s. The electromagnetic waves produced by the radar gun in the police car have a frequency of 8.25 × 10⁹ Hz. What is the magnitude of the difference in frequency between the waves emitted by the gun and those that are reflected back from the speeding minivan?

A) 180 Hz
B) 390 Hz
C) 770 Hz
D) 1440 Hz
E) 2100 Hz

Correct Answer:

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