The equation of a wave travelling along the positive x-direction is given by;
y = 0.25 x 10^-3 sin (500t - 0.025x).
Determine the angular frequency of the wave motion.

• A.0.25 x 10^-3rad s^-1
• B.0.25 x 10^-1rad s^-1
• C.5.00 x 10²rad s^-1
• D.2.50 x 10³rad s^-1
• E.