Speed of the Radiowaves, Gamma rays, X-rays and Microwaves are represented by $V_R, V_G, V_X$ and $V_M$ respectively in free space. Which option is correct?

$V_R=V_G=V_X=V_M$

The correct answer is Option (4) → $V_R=V_G=V_X=V_M$

In free space, the speed of all EM waves is the same and equal to speed of light.

$V_R=V_G=V_X=V_M=c=3×10^8m/s$