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 8)
 EXAMPLE 8 1
Heinrich Rudolf Hertz
(1857 – 1894) German
physicist who was the
first to broadcast and
receive radio waves