問題詳情

17. Electromagnetic standing waves are set up in a conducting cavity resonator in the form of a hollow metal box. The wavesbounce back and forth between two parallel surfaces separated by 0.8 cm. What is the minimum resonant frequency for such aresonator?
(A) 3.30 GHz
(B) 4.42 GHz
(C) 12.4 GHz
(D) 15.5 GHz
(E) 18.8 GHz

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