HW $12$ Electromagnetic Waves

Key Example Variation Problem $32\mathrm{.}2$

Part E

The electric field in a sinusoidal electromagnetic wave in vacuum is given by E$($y$,$t$)=^(2\mathrm{.}45106$V$/$m$)$cos$[(6\mathrm{.}50106$rad$/$m$)$y$$t$]$E$($y$,$t$)=^(2\mathrm{.}45106$V$/$m$)$cos$[(6\mathrm{.}50106$rad$/$m$)$y$$t$].$ Find the wavelength.

Express your answer with the appropriate units.