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

question 62

Multiple Choice

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

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