Doppler effect
A sound source is moving with velocity v
along the horizontal axis. Every period T a wave front leaves the
source and travels with velocity c with respect to a medium (say
air), which may be still or move with velocity (Vx, Vy)
= (Vx, Vy). A detector is
located at position (x, y) and may move with velocity (dx/dt,
dy/dt).
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You may edit the values of the aforementioned quantities, as well as
the time interval dt between animation frames.
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The detector position may also be chosen by means of the mouse.
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Press Initial to set t = 0 and the source at its initial
position.
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Press Continue to start or continue the animation.
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Press Stop to pause the animation, and Reset to recover
the default settings.
In the graphics window below the animation a vertical red
(green) bar is displayed each time a wave
front leaves the source (reaches
the detector).