The Electric Field of an Electro-Magnetic Wave Is Given by E_y

Multiple Choice

The electric field of an electro-magnetic wave is given by E_y = 25 sin(2.4 $\times$ 10⁶ $\pi$ (x - 3.0 $\times$ 10⁸t) ) .What is the frequency of the wave?

A) 4.8 $\times$ 10⁷ s^-1
B) 3.6 $\times$ 10¹⁴ s^-1
C) 1.2 $\times$ 10⁶ s^-1
D) 2.3 $\times$ 10¹⁵ s^-1
E) none of the above