Question

Equation for wave vector is

Answer 1

E describes the electric field, B the magnetic induction (H-magnetic field). The poynting vector P=ExH explains that E and H are vertical to P. The wave vector is needed to describe the wave function, for instance E = Eosin(wt-kr).

Answer 2

Answer:

k = 2π/λ

Explanation:

The magnitude of the wave vector (with units of m−1) is the wavenumber as defined by

wavenumber

where λ is the wavelength in the medium (not the vacuum wavelength).

In non-isotropic media, the direction of energy flow, which is the direction of the Poynting vector, can somewhat deviate from that of the wave vector, which is always perpendicular to the wavefronts.