To practice Problem$-$Solving Strategy $32\mathrm{.}1$ Electromagnetic Waves.

An electromagnetic wave in a vacuum traveling in the $+$x direction generated by a variable source initially has a wavelength of $225$ mm and a maximum electric field EmaxEmax in the $+$y direction of $3\mathrm{.}40103$ V$/$mV$/$m $.$ If the period of the wave is then increased by a factor of $2\mathrm{.}00,$ what is the equation of the resulting magnetic field component of the wave? What are the coefficients in the equation for the magnetic field component of the wave after the period increases by a factor of $2\mathrm{.}00?$