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Sounds can create a bow wave at the leading edge that ultimately results in a sonic boom.Does the same happen with light?
A common analogy is the sonic boom of a supersonic aircraft or bullet. The sound waves generated by the supersonic body do not move fast enough to get out of the way of the body itself. Hence, the waves "stack up" and form a shock front.In a similar way, a charged particle can generate a photonic shock wave as it travels through an insulator.
If so, does that not mean that the bow wave is travelling faster than light?
It is important to note, however, that the speed at which the photons travel is always the same. That is, the speed of light, commonly designated as c, does not change. The light appears to travel more slowly while traversing a medium due to the frequent interactions of the photons with matter. This is similar to a train that, while moving, travels at a constant velocity. If such a train were to travel on a set of tracks with many stops it would appear to be moving more slowly overall; i.e., have a lower average velocity, despite having a constant higher velocity while moving.
So the Speed of Light limit is maintained due to the Cherenkov factor being based on the Light being in a non vacuum e.g. water. in effect slowing the light.But in a vacuum are you saying there is no bow wave.