A rectangular waveguide with dimensions (a = 5 cm, b = 2.5 cm) and the medium inside this guide is air, the cut-off wavelength of waves TE01 and TE20

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Q: F2 = 20 N F1 = 40 N 30° ----- 30° F3 = 50 N

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Q: HW drive the next relationship 0 = ne² l m va

A: .