Physics · Electromagnetic Waves
An electromagnetically-shielded room is designed so that at an angular frequency ω = 107 rad/s, the intensity of the external radiation that penetrates the room is 1% of the incident radiation. If σ = 18π × 106 (Ω·m)-1 is the conductivity of the shielding material, its minimum thickness should be around _________ mm. (Given that ln 10 = 2.3)
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