Question

Velocity of light in centimeter per nano second is ......

Answer 1

Velocity of light $=3\times {10}^{8}m/s=3\times {10}^8\times {10}^{2}cm/s=\frac{3\times {10}^{10}\times {10}^{-9}}{{10}^{-9}}cm/s=30cm/ns$

where $1ns={10}^{-9}s$