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 The speed c of electromagnetic wave in vacuum is related to m0 and e0 (the
free space permeability and permittivity constants) as follows:
0
0
1/
c
µ ε
= The value of c equals the speed of light obtained from
optical measurements