Two loudspeakers are at opposite ends of a railroad car as it moves past a stationary observer at 10.0 m/s, as shown in Fig. 12-37. If the speakers have identical sound frequencies of 212 Hz, what is the beat frequency heard by the observer when
(a) He listens from the position A, in fro not the car,
(b) He is between the speakers, at B, and
(c) He hears the speakers after they have passed him, a C?

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=10.0 m/s