1.

An electromagnetic wave is represented by the electric field:\(\vec E = {{\rm{E}}_0}\hat n{\rm{sin}}\left[ {\omega t + \left( {6y - 8z} \right)} \right]\) Taking unit vectors in x, y and z directions to be \(\hat i,\;\hat j,\;{\rm{and}}\;\hat k\), the direction of propagation \(\;\hat s\), is:

A. \(\hat s = \frac{{3\hat i - 4\hat j}}{5}\)
B. \(\hat s = \frac{{ - 4\hat k + 3\hat j}}{5}\)
C. \(\hat s = \left( {\frac{{ - 3\hat j + 4\hat k}}{5}} \right)\)
D. \(\hat s = \frac{{4\hat j - 3\hat k}}{5}\)
Answer» D. \(\hat s = \frac{{4\hat j - 3\hat k}}{5}\)


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