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7. Two loudspeakers connected to the same signal generator are producing sound

of frequency 1000 Hz. The separation between the two loudspeakers is 2.0 m. n

obser!er who stands " m in front hears three consecuti!e loud sounds when he mo!es

through a distance at 1.#" m in the direction parallel to the speakers.$etermine%

&a' the wa!elength of the sound

&b' the speed of the sound wa!es in air.