GATE EC 1988 Electromagnetics Solution Q 5

GATE EC 1988 Electromagnetics Solution Q 5

For a normal mode EM wave propagating in a hollow rectangular waveguide_____.

a) the phase velocity is greater than the group velocity.

b) the phase velocity is greater than the velocity of light in free space.

c) the phase velocity is less than the velocity of light in free space.

d) the phase velocity may be either greater than or less than the group velocity.

Ans- a  and b

Explanation

v_p=\frac c{\sqrt{1-\left({\displaystyle\frac{f_c}f}\right)^2}} v_g=c\sqrt{1-\left(\frac{f_c}f\right)^2}

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