A high-pitched alarm on the end of a rope is whirled about the head.
What it shows:
Doppler shift of sound emitted by an object moving in a circular orbit, with the pitch clearly changing as the object move towards, away or perpendicular to the line of the observer. Useful as an analogy to the redshift and blueshift of spectral lines from a rotating astronomical source such as a planet or binary star system.
How it works:
We have a Powerhorn™ Security System buzzer attached to a 1.5m length of nylon cord. Swing it in a...
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