The distance (in meters) a wave has to propagate in a medium

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62

M: +2.00/-0.66

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

[GATE EC 2018]

A 0.12

B 0.23

C 0.46

D 2.3