A Pair of Speakers Emits Coherent Sound Waves in Phase

question 57

Multiple Choice

A pair of speakers emits coherent sound waves in phase at a frequency of 440 Hz. A microphone is placed such that it is 1.0 m from one speaker on a line that is perpendicular to the line between the speakers. Which of the following distances reflects a possible distance between the speakers if there is complete destructive interference at the location of the microphone? The speed of sound is 340 m/s.

• A) 1.0 m
• B) 0.77 m
• C) 2.76 m
• D) 1.3 m
• E) 1.77 m

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