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no it is not

ans2. It is important to specify the medium in which the phenomenon is acting. There is a prohibition on anything travelling faster than the speed of light in vacuo.

However this restriction is side-stepped in a medium in which light travels slower than in vacuo. Cherenkov radiationis one such example, where energetic particles travel faster in the medium (in this case usually water) than light would do.

Cherenkov's observations date to the 1930s.

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