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 tvt72z(q 6;cd3pbf-xf yu hhh./o;jnzqft*v /oward a brick wall in a crash test at 3h o3 sb;( 08a1acj,y.itm ltiw0 m/s. The horn is emitting a sound with frequency 250 Hz as 3jhiyat(oc8wb 1l;i0 am, .ts it approaches the wall. If the air is still and the speed of sound in air is 340 m/s, what beat frequency 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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