Two train whistles, Aand B, each have a frequency of 412 {\rm Hz}. A is stationary and B is moving toward the right(away from A) at a speed of 35.0 {\rm m}/{\rm s}. A listener is between the two whistles and ismoving toward the right with a speed of 15.0 {\rm m}/{\rm s}. (See the figure View Figure .)
What is the frequency from B as heard by thelistener?
What is the beat frequency detected by thelistener?


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