One can think of this radiation as the light equivalent of a "sonic boom," that one hears when objects move faster than sound. The result is a pervasive glow called "Cherenkov radiation," after Soviet radiation physicist Pavel Cherenkov who first observed this glow in 1934. As this particle is moving faster than light (in water), it will generate copious light photons that are in phase with each other.
This charged particle will excite the water molecules, causing them to emit a bluish light. These particles will not, of course, exceed the actual speed of light (c). Some charged particles can move faster than 0.75c in water and therefore travel faster than light. However, light travels at about 0.75c (75% light speed) through water. As a vacuum is devoid of such particles, light can attain its maximum velocity, which, as far as we know, cannot be surpassed. The presence of particles impedes the photons through scattering. However, 'c' refers to the speed of light propagating through a vacuum, which equals 299,792,458 metres per second.* Light slows down when it passes through other media, such as air or water. It is true, at least according to Einstein's Theory of Special Relativity, that light (denoted by 'c,' because it is a constant in all inertial reference frames) is the highest attainable velocity.
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