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A SURFACE WAVE WITH FREQUENCY W=3x10^-5 rad s-1 is propagating at a metal free space boundary . the plasma frequency of metal is 9x10^15 rad and er=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 um in the metal?ignore the collision effect