and w2 and Two parallel traveling plane waves have different angular frequencies w₁ pressure amplitudes P₁ and P₂. (a) Show that the instantaneous energy density ; at a point in space varies between (P₁ + P₂)²/poc² and (P₁ – P₂)²/poc². (b) Show that the total energy density at the point averages to the sum of the individual energy densities of each wave alone. Hint: Let the averaging time be much greater than 2πT/W1 - W₂.

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