Answered

A stationary police officer directs radio waves emitted by a radar gun at a vehicle moving toward the officer. Compared to the emitted radio waves, the radio waves reflected from the vehicle and received by the radar gun have a

(1)longer wavelength

(2)higher speed

(3)longer period

(4)higher frequency

Verified Answer :

Answer: The correct answer is higher frequency.

Explanation:  

Doppler's effect is defined as the apparent change in the frequency of an electromagnetic wave due to the relative motion of an observer and source.

In the given problem, a stationary police officer directs radio waves emitted by a radar gun at a vehicle moving toward the officer. In this case, there will be higher frequency.

If a stationary police officer directs radio waves emitted by a radar gun at a vehicle moving away the officer. In this case, there will be smaller frequency  but will have a longer wavelength.

Therefore, the radio waves reflected from the vehicle and received by the radar gun have a higher frequency.

The emitted radio waves, the radio waves reflected from the vehicle and received by the radar gun have a higher wavelength.

What is the Doppler effect?

A sudden change in the frequency due to the distance between the objects and source is explained by the doppler effect.

As the source and observer travel toward each other, the frequency of sound, light, or other waves increases or decreases.

The emitted radio waves, the radio waves reflected from the vehicle and received by the radar gun have a higher wavelength.

Hence option 4 is correct.

To learn more about the doppler effect refer to the link;

https://brainly.com/question/15318474

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