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Which situation is the best analogy for the Doppler effect?

A)

A large truck is harder to move than a smaller car.

A tennis ball strikes a wall and comes back to you.

A toy car moves from a carpet to a tile floor and turns.

D)

As you drive faster in the rain more raindrops strike your windshield.

D.

The Doppler Effect states that the frequency increases as an object approaches. As you drive faster in the rain more raindrops strike your windshield. This is the similar to the Doppler effect.

D) As you drive faster in the rain more raindrops strike your windshield.

Explanation:

The Doppler effect occurs when there is a change in the frequency of the source wave with respect to the motion of the observer. There is an apparent increase in the frequency of the emitted source when an observer moves towards the source. The wavelength stretches when an observer moves away from the emitting source. Consider the rain droplets fall towards the Earth in a slightly slanted towards eastwards. So, if you drive westwards, the frequency of the rain droplets hitting the windshield is higher. Similarly, if you drive eastwards, the frequency of the rain droplets striking your windshield will be lower.