The cut off frequency of a waveguide with resonant cavity is given by
(a) V√((m/a)^2 + (n/b)^2 + (p/d)^2)/2
(b) V√((m/a)^2 + (n/b)^2 + (p/d)^2)
(c) 2V√((m/a)^2 + (n/b)^2 + (p/d)^2)
(d) V√((m/a) + (n/b) + (p/d))/2
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This intriguing question comes from Transients in division Waveguides of Electromagnetic Theory
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