An Electromagnetic Wave Has an Electric Field Given By the Frequency of the Wave Is
A)

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 frequency of the wave is

A) $9.42 \times 10 ^ { 15 } \mathrm {~Hz}$
B) $9.42 \times 10 ^ { 15 } \mathrm { rad } / \mathrm { s }$
C) $1.5 \times 10 ^ { 15 } \mathrm {~Hz}$
D) $9.0 \times 10 ^ { 5 } \mathrm {~V} / \mathrm { m }$