Nuclear reactors start-ups 🔊

Watch the classic blue glow of the Cherenkov radiation, characteristic of an underwater nuclear reactor. The sharp sound heard is when the faster-than-sound movement occurs.

https://telegra.ph/file/ab5aa5c84a869a8ca6d88.mp4

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Discussion

The interesting thing is that the blue colour comes from kind of a supersonic bang of light. It occurs when charged particles like electrons move faster than light.