5 Steps to a 5: AP Physics 1, Algebra-Based 2020 by Greg Jacobs

Author:Greg Jacobs
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2019-08-16T16:00:00+00:00

Doppler Effect

Whenever a fire engine or ambulance races by you with its sirens blaring, you experience the Doppler effect. Similarly, if you enjoy watching auto racing, that “Neeee-yeeeer” you hear as the cars scream past the TV camera is also attributable to the Doppler effect.

FACT: The Doppler effect is the apparent change in a wave’s frequency that you observe whenever the source of the wave is moving toward or away from you.

To understand the Doppler effect, let’s look at what happens as a fire truck travels past you (see the following two figures).

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