Answer :
The energy at a point due to the sound wave is proportional to the square of the pressure amplitude. When two waves with the same frequency and constant phase difference interfere, the energy is redistributed because the resultant pressure amplitude p₀ is given by p₀2 = p₀₁2 + p₀₂2+ 2p₀1 p₀2 cosδ here p₀1 and p₀2 are pressure amplitudes of the two waves and δ is the phase difference. Since δ is constant here, so p₀ remains constant in time. Thus the energy redistribution remains constant in time. So the option D is correct.
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