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3 A train moving at 80 miles hr sounds the whistle of frequency 400 Hz...

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3 A train moving at 80 miles hr sounds the whistle of frequency 400 Hz when 1 mile away from a railway crossing What is the frequency heard by an observer 0 6 miles from the crossing perpendicular to the railway track given the speed of sound in air is 0 2 mile s a 440 Hz b 441 Hz c 442 Hz d 444 Hz

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