You stand by the railroad tracks as a train passes by.You hear a 1 020-Hz frequency when the train approaches,which changes to 760 Hz as it goes away.How fast is the train moving? The speed of sound in air is 340 m/s.
A)30.2 m/s
B)34.5 m/s
C)40.1 m/s
D)49.7 m/s
E)45.6 m/s

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The Answer of You stand by the railroad tracks as a train passes by.You hear a 1 020-Hz frequency when the train approaches,which changes to 760 Hz as it goes away.How fast is the train moving? The speed of sound in air is 340 m/s.
A)30.2 m/s
B)34.5 m/s
C)40.1 m/s
D)49.7 m/s
E)45.6 m/s

You Stand by the Railroad Tracks as a Train Passes