Which travels with the greatest speed in a vacuum?
A)radio waves
B)light waves
C)X-rays
D)gamma rays
E)all have the same speed

Question

Quizplus · Accepted Answer

Light waves travel with the greatest speed in a vacuum, which is approximately 299,792,458 meters per second (or 186,282 miles per second). This speed is often referred to as the speed of light and is the ultimate speed limit in the universe according to the theory of relativity. While radio waves, X-rays, and gamma rays are all forms of electromagnetic radiation like light waves, they travel at the same speed as light waves in a vacuum.

Which Travels with the Greatest Speed in a Vacuum