An electromagnetic wave is represented by the electric field

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

Problem

\vec{E} = E_0 \hat{n} \sin[\omega t + (6y - 8z)]

. Taking unit vectors in

x

y

and

z

directions to be

\hat{i}, \hat{j}, \hat{k}

, the direction of propagation

\hat{s}

is: (1)

\hat{s} = \frac{3\hat{i} - 4\hat{j}}{5}

(2)

\hat{s} = \frac{-4\hat{k} + 3\hat{j}}{5}

(3)

\hat{s} = \left(\frac{-3\hat{j} + 4\hat{k}}{5}\right)

(4)

\hat{s} = \frac{3\hat{j} - 3\hat{k}}{5}