The phase velocity of wave propagating in a hollow metal wave guide is:...

The phase velocity of wave propagating in a hollow metal wave guide is: 

(1) Greater than the velocity of the light in free space (2) Less than the velocity of the light in free space (3) Equal to the velocity of the light in free space (4) Equal to the group velocity
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1 Answer

Answer :

The phase velocity of wave propagating in a hollow metal wave guide is Greater than the velocity of the light in free space.

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