Chapter 14b - Chapter 14B Constructive and Destructive...

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Chapter 14B 1 Constructive and Destructive Interference Linear superposition occurs when sound waves meet: Constructive interference: The waves are “in phase” with each other. The waves reinforce each other. The result is an intensified sound. Destructive interference: The waves are “out of phase” with each other. The waves cancel each other. The result is a diminished sound.
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Chapter 14B 2 Constructive and Destructive Interference Both types of interference are present when two speakers are in phase and generating the same tone: Compressions Rarefactions Constructive interference Destructive interference λ Speaker Speaker
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3 Constructive and Destructive Interference Speaker Speaker d 1 d 2 Constructive interference occurs when: Destructive interference occurs when: d 1 - d 2 = 0, λ , 2 , 3 , . .. d 1 - d 2 = 1 2 , 3 2 , 5 2 , 7 d 2 | is the “path length difference.” The speakers are in phase.
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Chapter 14b - Chapter 14B Constructive and Destructive...

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