The Y Component of the Electric Field of an Electromagnetic

Multiple Choice

The y component of the electric field of an electromagnetic wave traveling in the +x direction through vacuum obeys the equation E_y = (375 N/C) cos[kx - (2.20 × 10¹⁴ rad/s) t]. What is the wavelength of this electromagnetic wave? (c = 3.0 x 10⁸ m/s)

A) 0.272 µm
B) 1.36 µm
C) 2.72 µm
D) 8.57 µm
E) 17.1 µm