Doppler Effect - Best YouTube videos

Doppler Effect Demonstrations and Animations 

https://www.youtube.com/watch?v=SqGtp6RQy_8

 


The Doppler Effect: what does motion do to waves?
https://www.youtube.com/watch?v=h4OnBYrbCjY

Doppler effect explained with the mathematics
https://www.youtube.com/watch?v=SeupIG-RWd8