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Question 5 • Physics

Which diagram best shows the perceived sound wave heard by a woman after a police car has passed her?

Answer

Image with description An illustration of a person listening to the siren of a passing police car. There are circles spreading out from the siren with the wavelength close together in the front and farther apart in the back.

Image with description An illustration of a person listening to the siren of a passing police car. There are circles spreading out from the siren that are concentric and evenly spaced.

Image with description An illustration of a person listening to the siren of a passing police car. There are circles spreading out from the siren with the wavelength longer closer to the siren and closer together the farther from the siren on both sides.

Image with description An illustration of a person listening to the siren of a passing police car. There are circles spreading out from the siren with the wavelength changing in all directions.

Explanation

After the police car passes the woman, it is moving away from her. The sound waves trailing behind the car are spread farther apart, so she hears a lower pitch. Choice A shows waves closer together in front of the car and farther apart behind it.

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