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An electromagnetic wave is represented by the electric field )] z 8 y 6 ( t sin[ n ˆ E E 0 − + ω = G . Taking unit vectors in x, y and z directions to be k ˆ , j ˆ , i ˆ , the direction of propagation s ˆ , is :

1. 5 j ˆ 3 k ˆ 4 s ˆ + − =
2. 5 k ˆ 3 j ˆ 4 s ˆ − =
3. ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + − = 5 k ˆ 4 j ˆ 3 s ˆ
4. 5 j ˆ 4 i ˆ 3 s ˆ − =

Correct answer: ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + − = 5 k ˆ 4 j ˆ 3 s ˆ

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