Skip to navigation | Skip to content  Doppler effect  Swing a
ringing phone inside a long sturdy sock and you will hear the
strangely familiar Doppler effect.  Doppler effect  Swing a
ringing phone inside a long sturdy sock and your audience will
here the strangely familiar Doppler effect. (Source: Ruben
Meerman/ABC Science)  Can't see the video? Download an mp4 [10.4
MB] version of this video.  Smart phones are expensive so please
take care not to swing yours too close to a wall or a person or
inside a sock that's almost worn right through. Other than that,
this is a very safe demonstration.  You'll need a smart phone
with internet access and a long sturdy sock.  For safety,
measure the sock fully stretched and keep at least that distance
away from walls and audience members during your demonstration.
On your smart phone, navigate to a free online tone generator
such as this one. You can set most online tone generators to any
audible frequency you like and you can adjust the volume using
the speaker setting