Question

How long would it take a radio-wave of frequency, $6\times {10}^3{sec}^{-1}$ to travel from Mars to the Earth, a distance of $8\times {10}^{7}km$.

Answer 1

Radio waves travel at the speed of light. So in this case distance = speed $\times$ time

Time = $\frac{8\times {10}^{7}Km}{3\times {10}^{8}m{s}^1}$ = 266.66 sec

Time = $\frac{266.66}{60}$

= 4.44 minutes