It can be shown from Maxwell’s equations that electric and magnetic fields in an electromagnetic wave are perpendicular to each other, and to the direction of propagation. Velocity of light depends on electric and magnetic properties of the medium. It has been shown by experiments on electromagnetic waves of different wavelengths that this velocity is the same (independent of wavelength) to within a few metres per second. Since it carries momentum, an electromagnetic wave also exerts pressure, called radiation pressure. The magnitude of the electric and the magnetic fields in an electromagnetic wave are related as B₀ = (E₀/c)