题目内容

8.“There are many advantages in doing a part-time job for a college student.” 这是一个非常好的主题句。___________

A. 对
B. 错

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1.Which sentence(s) can be used as a topic sentence?_________

A. The present condition of city vegetation and wild life protection in China is not satisfactory.
B. I want to say something about the present condition of city vegetation.
C. The present condition of wild life protection in China is not satisfactory.
D. The present condition of city vegetation in China is far from being satisfactory.

在双缝干涉实验中,入射光的波长为l,用玻璃纸遮住双缝中的一个缝,若玻璃纸中光程比相同厚度的空气的光程大2.5l,则屏上原来的明纹处

A. 仍为明条纹;
B. 变为暗条纹;
C. 既非明纹、也非暗纹;
D. 无法确定是明纹,还是暗纹.

用白光光源进行双缝试验,如果用一个纯黄色的滤光片遮盖一条缝,用一个纯蓝色的滤光片遮盖另一条缝,则: ( )

A. 干涉条纹的宽度将发生改变;
B. 产生红光和蓝光两套彩色干涉条纹;
C. 干涉条纹的亮度将发生改变;
D. 不产生干涉条纹。

两条狭缝相距2 mm, 离屏300 cm, 用600 nm的光照射时, 干涉条纹的相邻明纹间距为( )mm.

A. 6;
B. 0.9;
C. 9 ;
D. 0.6。