The dispersion equation of a waveguide, which relates the wavenumber k to the frequency ω, is \(k\left( \omega \right) = \left( {1/\;c} \right)\;\sqrt {{\omega ^2} - \omega _o^2} \) where the speed of light c = 3 × 108 m/s, and ωo is a constant. If the group velocity is 2 × 108 m/s, then the phase velocity is

The dispersion equation of a waveguide, which relates the wavenumber k

1.	The dispersion equation of a waveguide, which relates the wavenumber k to the frequency ω, is \(k\left( \omega \right) = \left( {1/\;c} \right)\;\sqrt {{\omega ^2} - \omega _o^2} \) where the speed of light c = 3 × 108 m/s, and ωo is a constant. If the group velocity is 2 × 108 m/s, then the phase velocity is
A.	1.5 × 108 m/s
B.	2 × 108 m/s
C.	3 × 108 m/s
D.	4.5 × 108 m/s
Answer» E.