For a rectangular waveguide of internal dimensions a × b (a > b), the cut-off frequency for the TE 11 mode is the arithmetic mean of the cut-off frequencies for TE 10 mode and TE 20 mode. If a = √5 cm, the value of b (in cm) is _______.

GATE Electronics and Communications (EC) 2014 Shift 2 Solved Paper

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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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