Two In-Phase Loudspeakers That Emit Sound with the Same Frequency

question 138

Multiple Choice

Two in-phase loudspeakers that emit sound with the same frequency are placed along a wall and are separated by a distance of 8.00 m.A person is standing 12.0 m away from the wall,equidistant from the loudspeakers.When the person moves 3.00 m parallel to the wall,she experiences destructive interference for the second time.What is the frequency of the sound? The speed of sound in air is 343 m/s.

• A)278 Hz
• B)422 Hz
• C)452 Hz
• D)562 Hz
• E)694 Hz

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