The speed of light in water is about 225,400 kilometres per second.
Yes, they travel some fast!
Copper is opaque to light - light can not travel though it.
About 2/3 the speed of light in a vacuum.
the speed of light
quite fast
it can travel from 380nm [nanometres] to 740nm
Darkness is the absence of light and will therefore travel at the speed of light (6x108m/s)
yes
at the speed of light
Speed of light.
Yes ... in a vacuum.
Approx 9.46 trillion km.