Grafik https://images.app.goo.gl/kYLETF8b6A5c3U6J7
Dopplereffekt, Animation, z.B. https://www.youtube.com/watch?v=bCP-viTPzHY
Besser kurz gekritzelt? https://www.youtube.com/watch?v=WgZ0-Nnn-6A
Ente, Wellen https://www.youtube.com/watch?v=2Qk_qL52Ua8&t=55s
(Dopplereffekt Experiment, Ton Messen https://www.youtube.com/watch?v=xKMX52JFTco )