Question:
An electromagnetic wave is represented by the electric field $\vec{E}=E_{0} \hat{n} \sin [\omega t+(6 y-8 z)]$. Taking unit vectors in $x$,
$y$ and $z$ directions to be $\hat{i}, \hat{j}, \hat{k}$, the direction of propogation
$\hat{s}$ is:
Correct Option: , 3
Solution:
(3) $\hat{S}=\frac{6 \hat{j}+8 \hat{k}}{\sqrt{6^{2}+8^{2}}}=\frac{-3 \hat{j}+4 \hat{k}}{5}$