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 train is traveling awa- f8;o ai9abhe -zyfnt2 c8hp6y from you at 13u1yvi)u q9a x g -rx4beuw-o120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. Wha v3y 1 )og-bquiuwxuarex19 -4t is the actual frequency of the whistle?
A. $444 \; Hz$
B. $439 \; Hz$
C. $364 \; Hz$
D. $361 \; Hz$
参考答案: B
本题详细解析:
暂无
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