Čerenkov effect
[Sonic Boom](https://texonom.com/sonic-boom-775aef3bf2a74899994f9f39bcf7db63) 


### Vavilov–Cherenkov radiation
charged particle이 매질에서 빛의 위상속도보다 빠른 속도로 움직일 때 전자기파를 방출하는 효과
![](https://www.notion.so/image/https%3A%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fcommons%2Fthumb%2F8%2F87%2FCherenkov_radiation-animation.gif%2F330px-Cherenkov_radiation-animation.gif?table=block&id=0e5d113c-3335-4fa5-92c4-56ccf1399ada&cache=v2)










