So the wavefront must travel at the speed of light. Iscatel Shutterstock Paul M. 2 f 1 v 2 2 f t 2.
The speed of light in a vacuum has the same constant value c in all inertial frames.
Why is the maximum speed of the universe the speed of light. Showing that the Speed of Light towards an Observer is Constant in a Vacuum. To sum up a wave equation directly follows from Maxwells equations and the implied EM wave has constant speed c. In a vacuum v ph c 0 299792458 meters per second a fundamental physical constant.