A phenomenon in which, when high-energy electrons pass through a substance such as water, the atoms and molecules in the substance are polarized by the electromagnetic field of the electrons and become excited. It´s called Cherenkov radiation. For this phenomenon to occur, the material must be a dielectric and electrons must travel faster than the speed of light in the material. If it isn´t a dielectric, it returns to a stable state without emitting light. If the charged particles are slower than the speed of light, the synchrotron radiation interferes and disappears and isn´t observed. At speeds faster than the speed of light, synchrotron radiation amplifies and reaches observable brightness. This light can be seen around spent fuel storage pools and cores of pool reactors.
The speed of light is slower in matter than in vacuum. The phenomenon of refraction occurs because the speed of light varies depending on the medium, and charged particles move at a speed faster than the speed of light in the material, generating Cherenkov radiation. The absolute refractive index of a ubstance is defined as the speed of light in a vacuum divided by the speed of light in that substance, and the speed of light in water is approximately 225,000 km/s.
@GeorgePDancejr Жыл бұрын
普通に考えても当たり前のことだね。c=1/(√(ε・μ))
@kana7222 Жыл бұрын
Does it mean that the light will also be delayed if there´s an obstacle?