The phase velocity of a wave having a phase constant of 4 units and a frequency of 2.5 x 109 radian/sec is (in 108 order)

The phase velocity of a wave having a phase constant of 4 units and a

1.	The phase velocity of a wave having a phase constant of 4 units and a frequency of 2.5 x 109 radian/sec is (in 108 order)
A.	t3.25
B.	t3.75
C.	t6.25
D.	t6.75
Answer» D. t6.75