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The cut off frequency for a waveguide to operate is

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The cut off frequency for a waveguide to operate is

(a) 3 MHz

(b) 3 GHz

(c) 6 MHz

(d) 6 GHz

This question was posed to me in an online interview.

I want to ask this question from Properties of Waveguides topic in portion Waveguides of Electromagnetic Theory

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Correct option is (d) 6 GHz

The explanation is: The cut off frequency of the waveguide is 6 GHz. This is the frequency at which the waveguide will start to operate.

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