本题目来源于试卷: Physics Unit12: Sound，类别为 通用国际物理
[单选题]
The frequency of a train u;42c snrl2pm7lwki -horn is 500 Hz. Assume the speed olo+4dbiht9 4 af sound in air is 340 m/s. Wha+h4a94io b dltt is the frequency heard by an observer if the observer is approaching the train with a speed of 30.0 m/s?
A. $456 \; Hz$
B. $500 \; Hz$
C. $544 \; Hz$
D. none of the above
参考答案: C
本题详细解析:
暂无
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