The distance (in meters) a wave has to propagate in a medium having a skin depth of 0.1 m so that the amplitude of the wave

Q. The distance (in meters) a wave has to propagate in a medium having a skin depth of 0.1 m so that the amplitude of the wave attenuates by 20 dB, is

(A) 0.12                      (B) 0.23                      (C) 0.46                      (D) 2.3

Ans: 0.23

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