### Explain absorption loss of metal shielding

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Absorption loss of metal shielding
A plane metal shield offers an absorption loss of 30 dB at a frequency of 10 kHz to normally incident radiated emission.

(a) Determine the absorption loss at 10 kHz in a shield of five times the thickness.

(b) Determine the absorption loss at 20 kHz in a shield of half the original thickness.

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