At this site, you can investigate the waves produced by a moving object, and you get to control the speed. You find out how the object's motion produces the change in the observed wave frequency--the Doppler shift. The waves fade away nicely as time passes so the display stays uncluttered and easy to interpret. For a related calculation, click on "Example of Curricular Material." This simulation of the Doppler effect is a Physlet produced at Davidson College.
%0 Electronic Source %A Christian, Wolfgang %T Doppler Physlet %V 2013 %N 10 December 2013 %9 application/java %U http://webphysics.davidson.edu/Applets/Doppler/Doppler.html
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