299,792,458 meters (186,282 miles) per second.
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The speed of light in any material medium is less than it is in empty space.
No, light in a medium will travel at a slower speed.
In any substance, all electromagnetic waves travel at the same speed that light travels through that substance.
light speed:)
The speed of light is the speed at which electromagnetic waves propagate through a medium. The speed of sound is the speed at which acoustic waves propagate through a medium. As the speed of sound relies on the medium moreso than the speed of light, sound propagates much slower than light.