The electric fields of two harmonic waves of angular frequency w, and w2₂ are given by E₁ = E₁,ocos (k₁y+wit)i and E₂ = E2,0cos (k₁y-w₂t)î. Find (a) the instantaneous Poynting vector for the resultant wave motion and (b) the time-average Poynting 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 -average Poynting vector.

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The electric fields of two harmonic waves of angular frequency w, and we are
given by E₁ E₁,0cos (k₁y + w₁t)i and E2 = E2,0cos (k₁y-w₂t)î. Find (a) the
instantaneous Poynting vector for the resultant wave motion and (b) the time-average
Poynting 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 -average
Poynting vector.
Transcribed Image Text:= The electric fields of two harmonic waves of angular frequency w, and we are given by E₁ E₁,0cos (k₁y + w₁t)i and E2 = E2,0cos (k₁y-w₂t)î. Find (a) the instantaneous Poynting vector for the resultant wave motion and (b) the time-average Poynting 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 -average Poynting vector.
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