=The electric fields of two harmonic waves of angular frequency w, and we aregiven by E₁ E₁,0cos (k₁y + w₁t)i and E2 = E2,0cos (k₁y-w₂t)î. Find (a) theinstantaneous Poynting vector for the resultant wave motion and (b) the time-averagePoynting vector. If the direction of propagation of the second wave is reversed, find (c)the instantaneous Poynting vector for the resultant wave motion and (d) the time -averagePoynting vector.

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