How fast do electro-magnetic waves travel?
A) at the speed of sound
B) at the speed of light
C) at the speed of charge
D) at different speeds, depending on the temperature of the atoms that produce them
E) they always have zero speed

Question

Quizplus · Accepted Answer

Electromagnetic waves, including visible light, travel at the speed of light, which is approximately 299,792,458 meters per second in a vacuum.

How Fast Do Electro-Magnetic Waves Travel