An Electromagnetic Wave Has an Electric Field Given By the Wavelength of the Wave 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 wavelength of the wave is

A) $2.0 \times 10 ^ { - 7 } \mathrm {~m}$
B) $2.0 \times 10 ^ { 7 } \mathrm {~m}$
C) $9.99 \times 10 ^ { 6 } \mathrm {~m}$
D) $3.1 \times 10 ^ { 7 } \mathrm {~m}$