GATE ECE 2015 Set 1 | Question: 25

Question

The electric field component of a plane wave traveling in a lossless dielectric medium is given by $\overrightarrow{E}(z,t)  = \hat{a}_y 2 \cos \bigg( 10^st-\frac{z}{\sqrt{2}} \bigg) \: V/m$. The wavelength (in m) for the wave is ___________.