Question

What distance does electromagnetic radiation travel in 0.48 ps ? express your answer using two significant figures?

Answer 1

Distance is given by speed × time
Speed of light is 3 × 10^8 m/s
The time of travel = 0.48 × 10^-12 or 4.8 × 10^-13 seconds
Therefore; 
the distance = (0.48 × 10^-13 )× (3 ×10^8 ) 
                    = 1.44 × 10^-4 m