As an electromagnetic wave travels through free space,its speed can be increased by:
A)increasing its frequency.
B)increasing its energy only.
C)increasing both its energy and momentum.
D)None of the above will increase its speed.

Question

Quizplus · Accepted Answer

The speed of an electromagnetic wave through free space is determined solely by the properties of free space, namely, the permittivity and permeability of free space. Therefore, neither changing the frequency nor increasing the energy or momentum will increase the speed of the wave.

As an Electromagnetic Wave Travels Through Free Space,its Speed Can