问题 实验题

在“用双缝干涉测量光的波长”实验中,实验装置如图所示。

(1)令单缝宽度为h,双缝距离为d,双缝与屏距离为l,当采取下列四组数据中的哪一组时,可能在光屏上观察到清晰可辨的干涉条纹______________。

A.    

B.     

C.     

D.    

(2)用某种单色光照射双缝得到如图甲所示的干涉条纹,则分划板在图甲中A、B位置时,游标卡尺读数分别为xA=________mm,xB=________mm,相邻两条纹间距△x=_________mm。

(3)如果测量头中的分划板中心刻线与干涉条纹不在同一方向上,如图乙所示。则在这种情况下波长的测量值_____________实际值。(填“大于”、“小于”或“等于”)

答案

(1)B

(2)11.1,15.6,0.75  

(3)大于  

阅读理解

阅读下面短文,简要回答所给问题。

     The first Earth Day was in 1970. People were beginning to worry about what we were doing to our

environment. So they set up Earth Day to tell everyone about their worries.

     In 2007 organizers m over 150 countries planned over 4,000 big events. But Earth Day is not just about

marches (游行) and big events. In the week around Earth Day (22 April) there were many thousands of

smaller, local events. These events dealt with environmental problems in the neighborhood.

     The World Wide Fund for Nature made a list of 5 things that each person could do to save the environment. 

     * Don't leave the tap running.

     * Turn off lights when you leave a room.

     * Turn off your computer every night.

     * Wash your clothes, and yourself, in warm or cold water, not hot water.

     * Dishwashers use as little water as possible. If we all do at least 2 0f these all the time, we can make a big

difference.

1. What is the purpose for people to set up Earth Day?

    ________________________________________________________________________________

2. When is Earth Day? 

    ________________________________________________________________________________

3. What should people do when the water keeps running from a tap? 

    ________________________________________________________________________________

4. Does the word "dishwashers" mean "machines for washing dishes"?

    ________________________________________________________________________________

5. Besides the five, what else can you do to save our environment? (One example is OK.) 

    ________________________________________________________________________________

不定项选择