Ron is standing near a railroad track. A train is moving toward him at 60 mph, and it blows its horn. What will Ron notice as the train moves past him?
A) As the train moves away, the frequency of the horn will be higher than when the train comes closer.
B) As the train approaches, the horn will sound higher in pitch than when the train moves away.
C) The horn will produce a multiple echo effect as the train moves closer to Ron.
D) There will be no change in the pitch of the horn as the train moves past Ron.
B
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A. 
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B. 
Li + e- +
C. Li + e- + ?
D. Li + e-
E. 
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