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A train A crosses a station with a speed...


A train A crosses a station with a speed of 40 m/s and whitles a short pulse of natural frequency `n_0=596Hz` another train B is approaching towards the same station with the same speed along a parallel track, Two track are `d=99m` apart. When train A whistles. train B is 152 m away from the station as shown in Fig. If velocity of sound in air is `v=300(m)/(s)`. calculate frequency of the pulse heard by driver of train B.

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