Translations

Code	Language		Translator	Run
es	Spanish	español	Google
sv	Swedish	svenska	Google
zh CN	Chinese (CN )	中文（CN ）

Credits

Fu-Kwun Hwang and remixed by lookang (This email address is being protected from spambots. You need JavaScript enabled to view it.); lookang

 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