Since some mediums have an index of refraction more than 1, light goes slower than in a vacuum. Does this mean it is possible for particles to go faster than the speed of light in these mediums? If so, is there any effects that arise from this?
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Yes, this does happen. Cherenkov radiation is a well known effect. It produces that blue glow you might have seen in pictures of nuclear reactors resulting from electrons passing through water a speeds faster than light.
M. Enns
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