2. Find the group and phase velocity of a guided mode in a hollow waveguide. (i) Show that their product is always a constant. (ii) Explain why the group velocities are zero and the phase velocities are infinite right at cut-off of a mode. (iii) What do the group and phase velocities become when the frequency is very high? Explain why?

2. Find the group and phase velocity of a guided mode in a hollow waveguide. (i) Show that their product is always a constant. (ii) Explain why the group velocities are zero and the phase velocities are infinite right at cut-off of a mode. (iii) What do the group and phase velocities become when the frequency is very high? Explain why?

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Question

2. Find the group and phase velocity of a guided mode in a hollow waveguide.
(i) Show that their product is always a constant.
(ii) Explain why the group velocities are zero and the phase velocities are infinite right at
cut-off of a mode.
(iii) What do the group and phase velocities become when the frequency is very high?
Explain why?

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