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The phase velocity of a wave having a phase constant of 4 units and a frequency of 2.5 x 10^9 radian/sec is (in 10^8 order)(a) 3.25(b) 3.75(c) 6.25(d) 6.75The question was posed to me during a job interview.This is a very interesting question from Phase and Group Velocity in section Waveguides of Electromagnetic Theory

Answer» RIGHT OPTION is (c) 6.25

The explanation is: The PHASE velocity and the phase constant are related by VP = ω/βg. On substituting for ω = 2.5 x 10^9 and β = 4, we get the phase velocity as 6.25 units.


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