A violin player riding on a slow train plays a 440 Hz note. Another violin player standing near the track plays the same note. When the two are close by and the train approaches the person on the ground, he hears 4.0 beats per second. The speed of sound in air = 340 m/s.
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Given:
Frequency of violins 
Speed of sound in air 
Let the velocity of the train (sources) be 
.
Beat heard by the standing man 
frequency 
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