An important practical application of the Doppler effect is the use of radar to

Question

An important practical application of the Doppler effect is the use of radar to determine the speed of a moving object. In this case the Doppler shift of the electromagnetic radar signal reflected from the moving object is directly proportional to the radial speed of the moving object with respect to the radar transmitter. If a police radar transmitter radiates at 11.7 GHz, calculate the frequency shift observed by the police for a car traveling at 48.4 mi/hr. Answer: Not yet correct, tries 3/10 Hint: Recall that for relfection problems, the signal is not simply Doppler shifted once, as it would be if the driver were detecting the signal from the police car. 21. [3pt] Calculate the frequency shift observed by the police for a car traveling at 72.1 mi/hr. Answer: 22. [3pt] What measurement precision in frequency is required to distinguish between the two cars? State your answer as the fraction Df/f. (How can such a high precision be obtained?) Answer:

Explanation / Answer

For this problem, i believe you have to use the equation f = fo((v/(v + vr)) where fo = frequency of observer v = speed of sound vr = speed of the frequency receiver you can reference this page for more information The observed frequency is increased if the source is moving towards the observer. It is decreased if the source is moving away.

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