本题目来源于试卷: Physics Unit12: Sound，类别为 通用国际物理
[单选题]
The frequency of a trije 2kt9w:b1w a j;it-ain horn is 500 Hz. Assume the speed of sound in air ise-2zb j)idykg*- s+e v 340 m/s. What is the frequency d sj)i* v2ebe-+ kz-ygheard by an observer if the observer is moving away from the train with a speed of 30.0 m/s?
A. $500 \; Hz$
B. $456 \; Hz$
C. $548 \; Hz$
D. none of the above
参考答案: B
本题详细解析:
暂无
| 
