18. A police radar operates on a frequency of 1GHz. What is the value of the frequency shift received by the police after the signal is reflected by a car moving away from the police at the velocity 150 km/hr?

(A) 278 Hz

(B) 2.78 kHz

(C) 27.8 kHz

(D) 278 kHz

(E) 2.78 MHz

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