Question: Write an expression in Cartesian coordinates for a harmonic plane wave of amplitude A and frequency propagating in the direction of the vector k,

Write an expression in Cartesian coordinates for a harmonic plane wave of amplitude A and frequency ω propagating in the direction of the vector k, which in turn lies on a line drawn from the origin to the point (4, 2, 1). [First determine vector k and then dot it with vector r.]

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