Question

Which places the items in order from fastest to slowest?

A.
the speed of light through outer space; the speed of light through air; the speed of light through glass

B.
the speed of light through glass; the speed of light through air; the speed of light through outer space

C.
the speed of light through glass; the speed of light through outer space; the speed of light through air

D.
the speed of light through air; the speed of light through glass; the speed of light through outer space

Answer 1

The denser your medium, the slower light travels through it. Outer space is basically a vacuum, so there's hardly anything to slow the speed of light. Air is composed of gas particles which slow the speed of light a bit, but still it's not too dense. Glass is a solid and is obviously much denser, and so slows the speed of light the most.

A is your answer!

Answer 2

A

Answer 3

a