a shielding enclosure with no apertures has a shielding

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A shielding enclosure with no apertures has a shielding effectiveness of 100 dB at 100 MHz. Determine the shielding effectiveness of the enclosure, at 100 MHz and at 200 MHz, if 20 closely spaced, equal size apertures were cut into one of its panels. Each of the apertures would have a  maximum dimension of 3 cm.

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