If in a rectangular waveguide for which a 5 2b, the cutoff frequency for TE 02 mode

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If in a rectangular waveguide for which a 5 2b, the cutoff frequency for TE02 mode is 12 GHz, the cutoff frequency for TM11 mode is
(a) 3 GHz 

(b) 3√5 GHz
(c) 12 GHz

(d) 6√5 GHz

(e) None of the above

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