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 sirebtn ekjuh:-0 wt0li3 :n. It is travg-z joob )n.1 3 6g.ewrh-q8 kidgb)qseling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadside. What cha)b 1.6ebqg o-o)i-. n3rqsjzhwkg8dgnge of frequency does 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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