本题目来源于试卷: Doppler Effect，类别为 美国物理杯赛(Physics Bowl)
[单选题]
02.47: A car heads toward a brick wall inr/ yw yi -*ndnk5mph,7 a crash test at 30 m/s. The horn isb b;a h4tte 3p k.kyyw2a*0um) emitting a sound with frequency 250 Hz as it approaches the wall. If the air is still and the speed of sound in air is 340 m/s, what beat freq)b ay4t 02yea;tukkbmh* w.p 3uency from the horn would the driver of the car detect?
A. 0 Hz
B. 22 Hz
C. 24 Hz
D. 41 Hz
E. 48 Hz
参考答案: E
本题详细解析:
暂无
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