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A physics question related to wave interference
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[QUOTE="nasu, post: 6639157, member: 147320"] The "trick" of the question is to realize the difference between the behaviour of the particle displacement and acoustic pressure in a sound wave in air. The longitudinal sound waves in a gas are usualy descrbed in terms of acosutic pressure. The maximum audible effect happens when the acoustic pressure is maximum. So here you do have a node in the middle but this means that the acoustic pressure is zero and you will detect no sound. However, the particle displacement follows an oscillation with 90[SUP]o[/SUP] phase difference compared with the acoustic pressure. Maximum acoustic pressure means zero displacement and vice-versa. Acoustic pressure ([I]p[/I]) is the difference between the actual pressure and the equilibrium pressure. It can e positive or negative. In the middle point, one wave have positive [I]p[/I] and the other negative [I]p [/I]and the sum is zero. However, as [USER=229090]@TSny[/USER] has nicely showed in the diagram, the displacements are actually adding in the center and the result is a maximum displacement. [/QUOTE]
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A physics question related to wave interference
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