Cherenkov radiation

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What Wikipedia says

Cherenkov radiation () is an electromagnetic radiation emitted when a charged particle (such as an electron) passes through a dielectric medium (such as distilled water) at a speed greater than the phase velocity (speed of propagation of a wavefront in a medium) of light in that medium.

Excerpt from the Wikipedia article “Cherenkov radiation”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: United States Nuclear Regulatory Commission, Public domain, via Wikimedia Commons.