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The sin θ in the waveguide refers to the ratio of the

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The sin θ in the waveguide refers to the ratio of the

(a) Frequency to wavelength

(b) Wavelength to frequency

(c) Cut off frequency to frequency

(d) Frequency to cut off frequency

I got this question in a national level competition.

The question is from Cut-off Frequency and Wavelength topic in division Waveguides of Electromagnetic Theory

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Right option is (c) Cut off frequency to frequency

The best explanation: The ratio of the cut off frequency to the frequency at any point gives the sin θ in a waveguide.

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