PURPOSE: To demonstrate the Doppler effect.

DESCRIPTION: A ball that emits a high-pitched squeal is hooked to the end of a cord and whirled about the instructor's head or thrown from person to person. The Doppler effect can easily be heard throughout even a large room.

SUGGESTIONS: Click here to hear a song about the doppler effect, performed by the a capella choral group AstroCapella.

REFERENCES: (PIRA 3B40.10) A softer alternative is H2-42: DOPPLER EFFECT - TUNING FORK ON STRING.

EQUIPMENT: Doppler ball on string.

SETUP TIME: None.