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The v number of a waveguide having 120 modes is(a) 15.5(b) 18(c) 24(d) 12I had been asked this question in my homework.Question is from Transverse Magnetic Waves(TM) topic in chapter Waveguides of Electromagnetic Theory

Answer»

Correct choice is (a) 15.5

Easy EXPLANATION: The NUMBER of modes in a waveguide is given by m = V^2/2. On substituting for m = 120, we GET V = √(2 X 120) = 15.5.



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