问题 实验题

双缝干涉实验装置如图所示,双缝间距离为d,双缝到像屏间距为L,调整实验装置使像屏上见到清晰的干涉条纹,关于该干涉条纹及改变条件后干涉条纹的变化情况,下列叙述中正确的是

(      )

A.屏上所有亮线都是从双缝出来的两列光波的波峰与波峰叠加形成的,而所有暗线是波谷与波谷叠加形成的

B.若将像屏向右或向左平移一小段距离,屏上仍有清晰的干涉条纹

C.若将双缝间距d减小,像屏上两相邻明条纹间距变小

D.若改用频率较大的色光进行实验,在其他条件不变的前提下.像屏上两相邻暗条纹间距变小

答案

BD

阅读理解

To Make Everybody Happy

Peter’s uncle lives in the country. Once in summer, Peter goes to stay with him for a few weeks. Whenever they go for a walk or for a drive in the car and pass somebody, his uncle waves to the passer-by. Peter is surprised and says, “Uncle Georage, you seem to know everybody here. Where did you meet them all?”

“I don’t know all these people.” answers his uncle. “Then why do you wave to them?” “Well, Peter ,” says his uncle “When I wave to someone who knows me, he is pleased. He goes on his journey with a happier heart. But when I wave to someone who doesn’t know me , he is surprised and says to himself, ‘ Who is that man? Why did he wave to me?’ So he has something to think about during the rest of his journey, and that makes his journey seem shorter.So.I.make.everybody.happy.

小题1: Peter goes to the country_______.

A.for his winter holidays

B.to see his sick uhcle

C.to spend summer with his uncle

D.because he gets into trouble小题2:When they pass somebody at any time,________.

A.George will stop and say hello to everybody

B.Peter’s uncle waves to the passer-by

C.Peter waves to the pass-by

D.Geoge introduces the person to Peter小题3:Peter ________ when he sees uncle waves to everybody passing by.

A.always asks his uncle “Who is that man?”

B.is very happy

C.is not surprised at all

D.is very surprised小题4:Georage tells peter________.

A.he knows all the people

B.he does not know all the people

C.he only knows one of them

D.he doesn’t know any one of the people小题5:George waves to every passer – by________.

A.to make everybody happy

B.to make Peter happy

C.only to make joke

D.to make himself happy

判断题