本题目来源于试卷: Physics Unit12: Sound，类别为 国际高中通用物理
[单选题]
A police car has an 800-Hz siren. gp7wtytd *q.,It is traveling at 35 m/s on a day whens ;ly kx,at9j9 the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadside. What change of frequency doesy;k9s l,tax9 j the observer hear?
A. zero
B. $82 \; HZ$
C. $166 \; Hz$
D. $249 \; Hz$
参考答案: C
本题详细解析:
暂无
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