本题目来源于试卷: Physics Unit12: Sound，类别为 通用国际物理
[单选题]
The Doppler shift expqxli (3n qp06o 1kxh1)nzr :y)rbds7pp (l htd(g4wmqps.vu 6mg1: ae:km,y)lains
A. why the siren on a police car changes its pitch as it races past us.
B. why a sound grows quieter as we move away from the source.
C. how sonar works.
D. the phenomenon of beats.
E. why it is that our hearing is best near 3000 Hz.
参考答案: A
本题详细解析:
暂无
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