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]
The frequency of a tr*ngnqi,etf+ .3(q2ad0pix j: bf nho1ain horn is 50dgg dpp*53rdd njn;ov 91o d.bzjz5950 Hz. Assume the speed of sound in air is 340 m/s. o5gp9vo5.dz1b*dnjdg dj35 n 9d;pz rWhat is the frequency heard by an observer if the observer is approaching the train with a speed of 30.0 m/s?
A. $456 \; Hz$
B. $500 \; Hz$
C. $544 \; Hz$
D. none of the above
参考答案: C
本题详细解析:
暂无
| 
