In a plane electromagnetic wave

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Waves Sound and Physical Optics · Waves Sound and Physical Optics

Problem

In a plane electromagnetic wave, the directions of electric field and magnetic field are represented by

\hat{k}

and

2\hat{i} - 2\hat{j}

, respectively. What is the unit vector along direction of propagation of the wave. (1)

\frac{1}{\sqrt{2}}(\hat{i} + \hat{j})

(2)

\frac{1}{\sqrt{2}}(\hat{j} + \hat{k})

(3)

\frac{1}{\sqrt{5}}(\hat{i} + 2\hat{j})

(4)

\frac{1}{\sqrt{5}}(2\hat{i} + \hat{j})