18. Waves & Sound

The Doppler Effect

Doppler Effect for Moving Source 2 of 2 (and Red Shift and Whatnot) | Doc Physics

As you stand beside the road singing a lovely <math display="inline"><mrow><mn>450</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">Hz</mi></mrow></math> note, your friend, Lisa, drives toward you at <math><mrow><mn>26</mn><mo rspace="thickmathspace">&#x2062;</mo><mi mathvariant="normal" class="MathML-Unit">m</mi><mo>/</mo><mi mathvariant="normal" class="MathML-Unit">s</mi></mrow></math>. What frequency does Lisa hear as she listens to you croon?

A police radar gun used to measure the speed of cars emits an electromagnetic wave (a radio wave) with a frequency of <math display=“inline”><mrow><mn>24</mn><mtext>&#x00A0;</mtext><mtext>GHz</mtext><mo>.</mo></mrow></math> In an area where the speed limit is <math><mrow><mn>30</mn><mtext></mtext><mtext>&#x00A0;m/s</mtext></mrow><mo>,</mo></math> what should be the shift in the frequency of the wave after reflecting off traffic that is exactly following the speed limit, driving toward the police officer?

Doppler Effect

What Is the Doppler Effect? | Physics in Motion

The Doppler Effect: what does motion do to waves?

fD,towards=639 m/s, fD,away=761 m/s

fD,towards=644 m/s, fD,away=767 m/s

fD,towards=761 m/s, fD,away=638 m/s

fD,towards=767 m/s, fD,away=644 m/s

A police siren emits a sound somewhere around 700 Hz. If you are waiting at a red light, and a police car approaches you from behind and passes you, moving at a constant 30 m/s, what is the frequency you hear from the siren as it approaches you from behind? What about once it’s passed you? Assume the air temperature to be 20°C.

How the Doppler effect works

Doppler Effect Demonstrations and Animations

Two Submarines Approaching One Another

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