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A person is driving north in a car at a constant speed. A police officer is driving south toward him at a constant speed. The police officer uses a radar unit to measure the speed of the person’s car. The radar unit sends out waves of a certain frequency toward the person’s car. The waves reflect off the person’s car and travel back to the radar unit in the police car.
What happens to the frequency of the waves detected by the radar unit?
A )The frequency is lower as the person’s car approaches.
B) The frequency is higher as the person’s car approaches.
C) The frequency remains the same but with increased energy as the person’s car approaches.
D) The frequency remains the same but with decreased energy as the person’s car approaches.