The electric field component of a plane wave travelling through a loss less dielectric medium is given by: \(\vec{E} (z,t)= [2 \cos (10^{8} t - \frac{z}{2})] \hat{y} \) V/m. The wavelength in (nm) for the wave is given by:
1
\( 1.26 \times 10^{11} \) nm.
2
\( 1.26 \times 10^{10} \) nm.
3
\( 1.28 \times 10^{11} \) nm.
4
\( 1.27 \times 10^{10} \) nm,