## College Physics (4th Edition)

A beam of light travels 30 centimeters in $1~ns$
We can find the distance a beam of light travels in $1~ns$: $d = c~t$ $d = (3.0\times 10^8~m/s)(1.0\times 10^{-9}~s)$ $d = 0.30~m = 30~cm$ A beam of light travels 30 centimeters in $1~ns$.