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1. Assertion (A): Conductors do not permit propagation of waves more than a short distance into the conductor at microwave frequencies.Reason (R): The relaxation time constant for conductors is much small than the period of centimetric EM wave.





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  • By: guest on 02 Jun 2017 12.54 am
    Depth of penetration = , where = relaxation time. δ would be small, if σ is large, which itself depends upon relaxation time. t for conductors is of the order of 10-14 s, for λ = 3 x 10-2 cm ∴ period of centimetric EM waves = Therefore, even though t is much smaller than period of centimetric waves but it is not the correct reason for the assertion given.
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