Electric and magnetic fields oscillate sinusoidally in space and time in an
electromagnetic wave The oscillating electric and magnetic fields, E and
B are perpendicular to each other, and to the direction of propagation of
the electromagnetic wave For a wave of frequency n, wavelength l,
propagating along z-direction, we have
E  = Ex (t) = E0 sin (kz – w t )
   = E0 sin    2
2
0
π
π
z
t
E
z
Tt
λ
ν
λ
−





 =
−






sin
B = By(t) = B0 sin (kz – w t)
   = B
z
t
B
z
Tt
0
0
2
2
sin
sin
π
π
λ
ν
λ
−





 =
−






They are related by E0/B0 = c 5