{source}

<?php 
require_once JPATH_SITE.'/TTcustom/TT_contentparser.php';
\(parameters = array("topicname" => "04waves_14sound",
 "modelname" => "ejss_model_dopplerxywee01");

echo generateSimHTML(\)parameters, "EJSS");
?>
{/source}

 http://iwant2study.org/lookangejss/04waves_14sound/ejss_model_dopplerxywee01/dopplerxywee01_Simulation.xhtml

Sounds coming from a moving source seem to change in pitch as their distance from the listener changes.

Other resources

http://www.lon-capa.org/~mmp/applist/doppler/d.htm

http://www.opensourcephysics.org/items/detail.cfm?ID=9982

https://cosci.tw/run/?name=EcF4ld1552613409730&fbclid=IwAR3pHi_xYUtBXu5aZSU4zkUCh6IpWuZpi4Y0SqVKdtEAwJDe8vnPUCVjT2k 

Video

https://www.youtube.com/watch?v=t0Bfq0UCuPc&fbclid=IwAR1kLYSrN8PJ6bsweExAqmPMsojhrLnN6AyYa6v1ZxrfbLphwtywzhJgdp4 

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