A transmission line of characteristic impedance 50W is terminated by a 50 W load. When excited by a sinusoidal voltage source at 10GHz, the phase difference between two points spaced 2mm apart on the line is found to be p/4 radians. The phase velocity of the wave along the line is
(A) 0.8 ´ 108 m / s
(B) 1.2 ´ 108 m / s
(C) 1.6 ´ 108 m / s
(D) 3 ´ 108 m / s
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