An Electromagnetic Wave Has an Electric Field Given By the Direction the Wave Is Traveling in Is
A)

Multiple Choice

An electromagnetic wave has an electric field given by $\vec { E } = - \left( 9.0 \times 10 ^ { 5 } \mathrm {~V} / \mathrm { m } \right) \hat { j } \cos \left[ \left( 9.42 \times 10 ^ { 15 } \mathrm { rad } / \mathrm { s } \right) t - k z \right]$ . The direction the wave is traveling in is

A) $\hat { k }$
B) $\hat { j }$
C) - $\hat { j }$

D) $\hat { i }$