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Why does the sound of a car change as it passes you?

Physicist Michio Kaku goes to the races to see the Doppler Effect in action and explain its relation to time.

The answer to the previous video. Did you get it right?

Find out why changing the water level in a bottle changes the sounds that it can make.

...Doppler Effect, where the pitch of a sound changes as it moves. Astronomers measured an analogous Doppler shift in star light to prove the existence of black holes. ABOUT THE SPEAKER: Walter H. G. ...