Applet: Doppler Effect

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Here you can visualize the Doppler effect. It's easy: Just click anywhere within the gray area and drag the mouse. An arrow representing the source velocity vector will appear. The speed of the source divided by the sound speed (= Mach number) is also displayed numerically. Let go of the mouse, and your source will move across the scrren, emitting waves.

Hint: Press the "s" key and the animation stops. Press it again, and it continues.