In the interface shown above the sound source (red box) is motionless. There are also two motionless observers (blue boxes). Assume the measurements in the interface are in meters. The tick marks between numbers are 0.2 meters each. It is common for sound waves to be shown with circles representing the wave front (the front of the compression part of the wave). Time is shown in the upper left hand corner next to the word tiempo.
The Doppler Effect in Sound
Now watch the video below (or here) of the interface again, but now the source (red box) is moving with a velocity of 0.50 m/s.
Electromagnetic Waves and Light
The Doppler Shift in Light
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