题干

用如图所示的实验装置观察光的薄膜干涉现象。图(a)是点燃酒精灯(在灯芯上洒些盐),图(b)是竖立的附着一层肥皂液薄膜的金属丝圈。下面说法正确的是                        (   )

A:火焰的像在肥皂液薄膜上

B:若要观察到图(b)中的干涉图样,人应位于金属丝圈的左侧

C:若要观察到图(b)中的干涉图样,人应位于金属丝圈的右侧

D:由于重力作用,使肥皂液薄膜上薄下厚,相当于三棱镜,所以这一现象实际上是光的色散

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答案(点此获取答案解析)

B

同类题4

假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的以下作文。文中共有十处语言错误,要求你在错误的地方增加、删除或修改某个词。

增加:在缺词处加一个漏字符号(∧),并在其下面写出该加的词。

删除:把多余的词用斜线(\)划掉。

修改:在错的词下划一横线,并在该词下面写出修改后的词。

注意:1).每处错误及其修改均仅限一词;

2).只允许修改10处,多者(从第11处起)不计分。

Dear Sir,

    How are you? As a exchange student, I am writing to tell you I prefer to move into a single room in next term, as I find it inconvenient to share a room with others. My roommate often held parties at night, made much noise. Besides, his friends are always visiting him, that disturbs me a lot. So I hope to draw your attentions to this problem. If you think in my position, I am sure he will agree that the only solution for me is get a room of my own, one not in the same building and as near to the school campus as possible. I would be gratefully if you could do me the favor.

                                                                                                                                                                                                  Li Hua