题目内容
(1)关于近代物理,下列说法正确的是________。(填选项前的字母)
(2)如图,质量为M的小船在静止水面上以速率V0向右匀速行驶,一质量为m的救生员站在船尾,相对小船静止。若救生员以相对水面速率v水平向左跃入水中,则救生员跃出后小船的速率为______。(填选项前的字母)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241344599894413.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413450002021919.png)
A.![]() |
B.核聚变反应方程![]() |
C.从金属表面逸出的光电子的最大初动能与照射光的频率成正比 |
D.玻尔将量子观念引入原子领域,其理论能够解释氦原子光谱的特征 |
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241344599894413.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082413450002021919.png)
(1)D ;( 2)C
(1)
射线是高速运动的氦原子核,答案A错;
;答案B错;从光电效应方程
可知最大初动能和入射光的频率成一次函数关系而非正比函数关系所以C错;正确答案选D.
(2)由动量守恒可知
解得小船的速度为答案C
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134500223310.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134500254708.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134500301850.png)
(2)由动量守恒可知
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824134500364915.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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