A rectangular waveguide is 4.2 cm by 1.85 cm. The cut-off frequency of the dominant mode through this waveguide is 

(a) 3.57 GHz (b) 3.75 GHz (c) 3.70 MHz (d) 3.57 MHz
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A rectangular waveguide is 4.2 cm by 1.85 cm. The cut-off frequency of the dominant mode through this waveguide is  3.57 GHz 

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