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Answer to Question #50215 in Other Physics for palash mura

Question #50215
a locomotive approach a crossing at a speed 20m/s sound a whistle of frequency 640 HZ when 1 KM from the crossing .there is no wind and the speed of sound in air 330m/s.what frequency is heard by an observer 1.732 km on the straight road from the crossing at right angle...
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