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1 answer:
The fastest thing in the whole universe is the speed of light in a vacuum. The speed is around 2.99 * . It is fastest in vacuum as vacuum does not contain any dust particles and is a hollow space so light travels faster. It also has a refractive index of 1 so it travels faster.
After vacuum light travels faster in air. Air has a refractive index of 1.0003.
After air, it travels faster in water. The speed is about 3/4 of its speed in a vacuum, or 225,000,000 meters per second. Speed slows in water because photons interact with atoms, which repeatedly absorb and re-emit them to the same direction. The refractive index of water is 1.33.
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