GATE 2014 ECE For a rectangular waveguide of internal dimensions…

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GATE 2014 ECE
For a rectangular waveguide of internal dimensions a × b(a > b) , the cut-off frequency for the TE11 mode is the arithmetic mean of the cut-off frequencies for TE10 mode and TE20 mode. If a = 5 cm, the value of b (in cm) is _____.

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