The electric and magnetic fields Ex
and By are perpendicular to each
other, and to the direction z of
propagation We can write Ex and
By as follows:
Ex= E0 sin (kz–wt)
[8 7(a)]
By= B0 sin (kz–wt)
[8 7(b)]
Here k is related to the wave length
l of the wave by the usual
equation
2
k
λ
π
=
(8