3. • Two in-phase speakers A and B are a distance DA apart, as shown in Fig- ure 26.49. A person stands A FIGURE 26.49 Problem 3. a distance d from speáker B. (a) Which distance, d or D, deter- mines whether this person hears constructive or destructive interference from these speakers? (b) If the person walks slowly toward (or away from) speaker B, will he hear a differ- ence in the loudness of the sound due to interference? Why? -D * B

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