Question

What is the velocity of all electromagnetic waves in a vacuum?

The velocity of electromagnetic waves depends upon their wavelength. Electromagnetic waves do not propagate forward; hence, their velocity is zero. The velocity of electromagnetic waves is nearly equal to 3 × 108 m/s. The velocity of electromagnetic waves depends upon their frequency. The velocity of electromagnetic waves depends upon their amplitude.

Answer 1

Answer:

The velocity of electromagnetic waves is nearly equal to 3 × 108 m/s.

Explanation:

All electromagnetic waves travel at the same speed in a vacuum. The value of their velocity does not depend neither on their frequency, nor on their wavelength.

The magnitude of their velocity is known as speed of light (labelled with c), and it is one of the universal physical constant:

$c=2.998 \cdot 10^8 m/s$

The velocity of electromagnetic waves changes instead when they travel in a medium (in particular, their speed decreases)