Two In-Phase Loudspeakers Are Some Distance Apart

question 32

Multiple Choice

Two in-phase loudspeakers are some distance apart. They emit sound with a frequency of 1536 Hz. You move between the speakers, along the line joining them, at a constant speed of 2.8 m/s. What beat frequency do you observe? The speed of sound in the room is 330 m/s.

• A) 13 Hz
• B) 431 Hz
• C) 26 Hz
• D) 4.7 Hz
• E) 118 Hz

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