问题
单项选择题
一声波波源相对媒质不动,发出的声波频率是ν0。设以观察者的运动速度为波速的1/2,当观察着迎着波源运动时,他接收到的声波频率是()。
A.2ν0
B.
C.ν0
D.
答案
参考答案:D
一声波波源相对媒质不动,发出的声波频率是ν0。设以观察者的运动速度为波速的1/2,当观察着迎着波源运动时,他接收到的声波频率是()。
A.2ν0
B.
C.ν0
D.
参考答案:D
—What’s the matter with you, Tom? —Oh, 小题1: Maybe I’ve got a cold. — 小题2: Why don’t you take some coldstop? — 小题3: —That’s what I took the last time I had a cold. 小题4: Maybe that’ll help. —Thanks. (Two days later) —How are you feeling now? —Getting better. — 小题5:
|