The phase velocity of wave propagating in a hollow metal waveguide is

1.	The phase velocity of wave propagating in a hollow metal waveguide is
A.	Greater than the velocity of light in free space
B.	Less than the velocity of light in free space
C.	Equal to the velocity of light in free space
D.	Equal to the group velocity
Answer» B. Less than the velocity of light in free space

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The phase velocity of wave propagating in a hollow metal waveguide is

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