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

0.12
0.23
0.46
2.3

Correct answer: 0.23

Solution

The amplitude of a wave attenuates by 20 dB when it travels a distance equal to approximately 0.23 times the skin depth, which is derived from the relationship between attenuation in decibels and distance in a medium.

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