Doppler Ball

Purpose

To demonstrate the Doppler effect.

Equipment

Doppler ball on string.

Images

h2-41

Description

A ball with a 3000 Hz whistle inside 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.

References

G. F. Herrenden Harker, The Doppler Effect When Both Source and Observer are in Motion, AJP 12, 175-177, (1944).