题目内容
如图所示为一列简谐横波t时刻的图象,波速为0.2 m/s, 则以下结论正确的是:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250052032015605.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250052032015605.png)
A.振源的振动周期为0.4 S |
B.该波在传播中遇到1 m的障碍物,能发生明显衍射现象 |
C.图示时刻质点a、b、c所受的加速度大小之比为2∶1∶3 |
D.经过0.2 s,质点a通过的路程不一定为30 cm. |
AC
试题分析:由图知,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005203232721.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250052032481171.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005203263464.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005203279903.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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