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AP Physics 2
14.6 Wave Interference and Standing Waves
IntermediateMCQConceptual22.8k
Two small rectangular speaker symbols, labeled Speaker 1 on the left and Speaker 2 on the right, lie along a horizontal line. Point P is depicted as a dot above Speaker 1, with a dashed line segment labeled 4.0 m extending from Speaker 1 to Point P and a dashed line segment labeled 5.0 m extending from Speaker 2 to Point P. Point Q is depicted as a second dot positioned to the right of Point P, with a dashed line segment labeled 4.0 m extending from Speaker 1 to Point Q and a dashed line segment labeled 5.5 m extending from Speaker 2 to Point Q. No other labels, lines, text, or axes appear.
Positions of the observer at points P and Q relative to Speakers 1 and 2.
Two small loudspeakers driven by the same audio generator emit coherent sound waves with a wavelength of \(\lambda = 1.0\text{ m}\), but are wired out of phase by \(180^\circ\). An observer is initially standing at point \(P\), located \(4.0\text{ m}\) from Speaker 1 and \(5.0\text{ m}\) from Speaker 2. The observer then moves to point \(Q\), located \(4.0\text{ m}\) from Speaker 1 and \(5.5\text{ m}\) from Speaker 2. Which of the following best describes the change in sound intensity detected by the observer when moving from point \(P\) to point \(Q\), and provides the correct justification?

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