An electromagnetic wave is represented by the electric field vector E = E0 nˆ sin[ ωt + (6y - 8z)] Taking unit vectors in x, y and z directions to be i,j ,k the direction of propagation sˆ , is :
(1) s = 4k + 3j/5
(2) s =4j - 3k/5
(3) s = (-3j + 4k/5)
(4) s = 3i - 4j/5