Northwestern Physics Demos                                 Go back to Sound
  
DCS# 3B40.18NWU# S-27Location:    7 B 2
title: Sonic Doppler Shift
aka: Doppler tuning fork/siren ball/Cenco Reed tube.

Description:
 1) A robust tuning fork that maintains its sound output for several seconds.  Move the fork toward or away from your audience to exhibit the shift in frequency.
  2) A piezo siren is incased in a ball and thrown across the room or swung in a circle on the end of a string.
  3) A reed is mounted on the end of a tube and the tube is spun as air is blown into the tube to make it sound.  Tube can be mounted on a motor or hand rotor.

Questions:
    When is the sound highter/lower?

    Would this work on the moon?
pix of set upalt equipalt pix