Electromagnetic Waves

$5 \times 10^{-7} \sin \left[\frac{x}{3}-6 \times 10^{+7} t\right] \hat{z} T$

$5 \times 10^{-7} \sin \left[\pi\left(\frac{x}{5}-6 \times 10^{+7} t\right)\right] \hat{\mathbf{z}} T$

$5 \times 10^{-7} \sin \left[\pi\left(\frac{x}{10}-3 \times 10^{+7} t\right)\right] \hat{z} T$

$5 \times 10^{-7} \sin \left[\pi\left(\frac{2 x}{5}-6 \times 10^{+8} t\right)\right] \hat{\mathbf{z}} T$