Physics Unit12: Sound (id: 1ff7b91c9)

本题目来源于试卷: Physics Unit12: Sound，类别为 通用国际物理

[单选题]
A sound source departs from a station-i lz1cf ++ pn5+kqjk:ke 1akuary observer. The fre7nahaeyo-* *yquency heard by the o * yno*ah-7aeybserver is

A. higher than the source.
B. lower than the source.
C. the same as that of the source.
D. equal to zero.


参考答案:  B


本题详细解析: 暂无

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