A police car’s radar gun emits microwaves with a frequency of f1 = 8.20 GHz. The beam reflects from a speeding car, which is moving toward the police car at 46.4 m/s with respect to the police car. The speeder’s radar detector detects the microwave at a frequency f2. A) How can you compare the two frequencies f1 and f2? B) Find the frequency difference f2 − f1 in kilohertz.

A police car’s radar gun emits microwaves with a frequency of f1 = 8.20 GHz. The beam reflects from a speeding car, which is moving toward the police car at 46.4 m/s with respect to the police car. The speeder’s radar detector detects the microwave at a frequency f2. A) How can you compare the two frequencies f1 and f2? B) Find the frequency difference f2 − f1 in kilohertz.

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