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3.Passage :Getting around the worldListen to the passage again and then complete the following sentences[音频][音频]1. Bowing is the traditional______________ in some Asian countries like Korea and Japan .2. When ______ friends meet in Russia , both men and women hug each other.3. Shaking hands is common in many countries. But it isn’t _____ done the same way.4. In many ______ , people also shake hands. But they do it differently from the way they do in the U.S. and Canada.5. Many people in Mexico and in Egypt ______. And their handshakes usually _______ a little longer but are softer.

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把双缝干涉实验装置放在折射率为n的水中,两缝间距离为d,双缝到屏的距离为D (D >>d),所用单色光在真空中的波长为λ,则屏上干涉条纹中相邻的明纹之间的距离是

A. 2nλD/d
B. nλd/D
C. nDd/λ
D. λD/(nd)

双缝干涉实验中,为使屏上的干涉条纹间距变小,可以采取下面哪种办法

A. 使屏远离双缝
B. 使两缝的间距变小
C. 把两个缝的宽度稍微调宽
D. 改用波长较小的单色光源

用白光光源进行双缝实验,若用一个纯红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. 干涉条纹的颜色将发生改变
B. 产生红光和蓝光的两套干涉条纹
C. 干涉条纹的亮度将发生改变
D. 不产生干涉条纹

在相同的时间内,一束单色光在空气中和在玻璃中

A. 传播的路程相等,经过的光程相等
B. 传播的路程相等,经过的光程不相等
C. 传播的路程不相等,经过的光程相等
D. 传播的路程不相等,经过的光程不相等

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