b) A surface wave with frequency ω = 3 × 10^(−5)
rad/ s
is propagating at a metal-free
space boundary. The plasma frequency of metal is 9 × 10^(15) rad and εr = 7. Estimate
k. If the amplitude of the wave is 10^(5)
Vm−1
at the surface, what will be its value at
the depth of 0.2 µm in the metal? Ignore the collision effect.
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