问题 选择题

(改、泸州市髙2011级第二次教学质量诊断性考试)在水面下同一深处有两个点光源P,Q它们分别发出不同颜色的光,当它们发光时,在水面上 P光比Q光照亮的水面区域小,以下说法正确的是(  )

A.P光的频率小于Q光的频率

B.P光的双缝干涉条级间的距离一定小于Q光的双缝干涉条级间的距离

C.在水中P光的传播速度大于Q光的传播速度

D.P光照射某种金属能发生光电效应,则Q光照射同种金属也一定能发生光电效应

答案

A、P光比Q光照亮的水面区域小,知P光发生全反射的临界角小,根据sinC=

1
n
,知P光的折射率大,折射率大,频率大.故A错误.

   B、P光的频率大,则波长短,根据△x=

L
d
λ,则P光的双缝干涉条级间的距离一定小于Q光的双缝干涉条级间的距离.故B正确.

C、根据v=

c
n
知,P光的折射率大,则在水中的波速小.故C错误.

D、P光照射某种金属能发生光电效应,Q光的频率小于P光,则Q光不一定能发生光电效应.故D错误.

故选B.

阅读理解

What is your favorite color? Do you like yellow, orange, or red? If you do, you must be an active person who enjoys life. Do you like blue? Then you are probably quiet, shy, and would rather follow than lead.

Colors do influence our moods (情绪). A yellow room makes most people feel more cheerful and more relaxed than a dark green one; and a red dress brings warmth and cheer to the saddest winter day. On the other hand, black is depressing(令人压抑的). There was a black bridge over the Thames River, near London. The number of people who killed themselves on that bridge used to be larger than on any other bridge in the area -- until it was repainted green.

Light and bright colors make people not only happier but also more active. In the factory, the workers will work better, harder, and have fewer accidents when their machines are painted orange rather than black.

小题1:An active person may like ____   

A.yellow, orange, or red

B.yellow, black, or red

C.orange, blue, or black

D.black, red, or orange小题2:Most people feel more __ in a yellow room than in a dark green one.

A.tired

B.bored

C.worried

D.relaxed小题3:More people killed themselves on the black bridge than on any other bridge probably because ____

A.the bridge was very tall

B.the bridge was too crowded

C.people didn't like the bridge

D.the color of the bridge was depressing小题4:In the factory, when the machines are painted orange, the workers will work __

A.worse

B.harder

C.more slowly

D.more angrily

单项选择题