Part A Police radar guns (Figure 1) work by measuring the change in frequency of

Question

Part A Police radar guns (Figure 1) work by measuring the change in frequency of a reflected pulse of electromagnetic waves. A gun reads correctly only if a car is moving directly toward or away from the person making the measurement. Explain why this is so Drag the terms on the left to the appropriate blanks on the right to complete the sentences Reset Help will be no Doppler shift The guns are calibrated for motion directly toward or away from the gun. If a car is moving perpendicular to the line of sight of the gun there exactly equal to what I Figure 1 1 of 1 If the car is coming or going at some other angle then there not slower than will be smaller Doppler shift not faster than So, if the radar gun reports that a car is moving at a certain speed, it is moving with the speed radar reports will be larger Doppler shit

Explanation / Answer

(A) When car moves perpendicularly then doppler effect will be very small

so we can say that there will be no doppler shift

(B) When car is moving at angle then parallel component of car velocity will be less than the actual velocity of car so there will be smaller doppler shift

(C) As Doppler shift was smaller than actual it means the velocity fo car will be not Slower than the radar reports

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