Question

what does an Electromagnetic wave consist of on what factors does it's velocity in vaccum depend

Answer 1

Electromagnetic Waves as its name suggests consists of oscillating Electric Field and Magnetic Field.

This simply means that at a point where these waves pass the electric field and magnetic field will change according to the wave.

Now Maxwell proved that in vaccum the speed of EM waves equals the speed of light 'c' and is a universal constant.

Thus its velocity depends on nothing its always constant in vaccum.

Answer 2

Answer:

Maxwell concluded that the variation in electric and magnetic field vectors perpendicular to each other leads to the production of electromagnetic waves in space. They can travel in space without any material medium.

There are sinusoidal variation of electric and magnetic field vectors at right angles to each other as well as right angles to the direction of wave propagation.

Velocity of an EM wave depends on

1. Permeability of free space

2.permittivity of free space

Velocity of EM waves in vaccum is 3*10^8 m/s

P. S.

Excuse any language errors, if any.