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GATE ECE 2018 | Question: 33

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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 

  1. $0.12$
  2. $0.23$
  3. $0.46$
  4. $2.3$ 
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