How many times greater is the speed of infrared light (λ = 800 nm) than the speed of violet light (λ = 400 nm) in a vacuum?
A) 2
B) 1/2
C) 400
D) 1; that is, both have the same speed.

Question

Quizplus · Accepted Answer

In a vacuum, all electromagnetic waves, including infrared and violet light, travel at the same speed, which is the speed of light (approximately 3 x 10^8 meters per second), regardless of their wavelength.

How Many Times Greater Is the Speed of Infrared Light