Question

13) (4p)Two in-phase loudspeakers are placed along a wall and are separated by a distance of 4.00 m. They emit sound with a frequency of 514 Hz. A person is standing away from the wall, in front of one of the loudspeakers. What is the closest distance from the wall the person can stand and hear destructive interference? The speed of sound in air is 343 m/s A) 1.2 m B) 0.73 m C) 0.26m D) 1.6m E) 0.34 m 13) 14) (Ip) If a guitar string has a fundamental frequency of 500 Hz, which one of the following frequencies can set the string into resonant vibration? A) 1750 Hz B) 750 Hz C) 1500 Hz D) 250 Hz 14) С
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