Doppler Effect Classes Used: PHYS 101, PHYS 153, ASTR 101

waves, Doppler

Useful Links: The BBC provides information on “Life, the Universe and Everything” originally started by Douglas Adams and provides quite a bit of trivia on the Doppler Effect. Updated on: 06/19/13

To demonstrate the Doppler effect.

Self-contained Doppler apparatus, green ball (to protect siren).

The unit is a self-contained apparatus containing a battery, oscillator and a speaker that is small enough to be whirled around one's head on a length of cord. Switch on and whirl around one's head at a reasonable speed and an apparent change in frequency will be observed by the class. Due to safety concerns, this demo has now been enclosed in a Nerf ball in the event that the one operating the demo has poor grip.