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The phase velocity of a wave with frequency of 15 radian/sec and group phase constant of 2 units is(a) 30(b) 15(c) 7.5(d) 2/15The question was asked in an international level competition.Question is from Properties of Waveguides topic in chapter Waveguides of Electromagnetic Theory

Answer»

Correct choice is (c) 7.5

Easy EXPLANATION: The phase velocity of a WAVE is GIVEN by Vp = ω/βg. on SUBSTITUTING for ω = 15 and βg = 2, we GET phase velocity as 15/2 = 7.5 units.



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