问题 多选题

下列关于光的现象的说法正确的是(  )

A.在光的双缝干涉实验中,若仅将入射光由紫光改为红光,则条纹间距一定变大

B.以相同的入射角从水中射向空气中,若紫光能发生全反射,那红光也一定能

C.以相同的入射角从水中射向空气中,若红光能发生全反射,那紫光也一定能

D.水中或玻璃中的气泡看起来特别明亮是因为光从水或玻璃射向气泡时,一部分光在界面上发生了全反射

答案

A、干涉条纹间距与波长成正比,在光的双缝干涉实验中,若仅将入射光由紫光改为红光,则条纹间距一定变大,A正确;

B、折射率大的临界角小,紫光的频率大,折射率大,临界角比红光的小,所以若紫光能发生全反射,那红光不一定能,B错误;

C、折射率大的临界角小,紫光的频率大,折射率大,临界角比红光的小,所以若红光能发生全反射,那紫光也一定能,C正确;

D、水中或玻璃中的气泡看起来特别明亮是因为光从水或玻璃射向气泡时,一部分光在界面上发生了全反射,D正确;

故选:ACD

单项选择题
阅读理解

Annalisee Brasil, a 14-year-old girl, is one of the brightest kids of her generation. When Annalisee was 3, her mother Angi noticed that she was stringing together word cards into correct sentences. After the girl turned 6, her mother took her for an IQ text. Her IQ is above 145, placing the girl in the top 0.1% of the population. Annalisee should be the star pupil at school. She is witty and pretty, and it’s easy to imagine she would get along well at school. But Annalisee’s parents couldn’t find a school willing to take their daughter. So her mother homeschooled Annalisee.

But Angi felt something was missing in her daughter’s life. Annalisee didn’t have a rich social network of other kids. She had trouble getting along with others. She described herself as a “perfectionist” and said other students sometimes were jealous of her.

What’s needed is a new model for gifted education. That’s the idea behind the Davidson Academy of Nevada. At the academy, all the kids are skipping ahead quickly. However, the academy’s most important gift to its students is social, not academic. One of the main functions of the school is to provide a good social setting for the highly gifted.

Last year the school enrolled Annalisee, which has been good for her. She has made friends at the academy. She has also developed an interest in calculus(微积分) and biochemistry(生物化学). Socially, Annalisee is finally learning to get along with others. “It’s been interesting having to deal with that and getting used to the judgments of other kinds,” she said. “We get into arguments a lot, because we’re all really smart people with opinions, and it doesn’t always turn out that great. Sometimes I take things a little too personally.”

What is the passage mainly about?

Annalisee Brasil——the star pupil at school.

A smart girl who entered a proper school and benefited from gifted education.

A smart girl who had trouble getting along with others.

A girl who was too smart to find a suitable school.

小题1:The word “perfectionist” in paragraph two probably means a person who _________.

A.is smarter than others

B.is always favored by teachers

C.can do everything well and has strong demands

D.is accepted by others as a good leader小题2:According to the passage, which of the following is true?

A.At the age of 3, Annalisee took an IQ test, in which she scored above 145.

B.Finding no school willing to take Annalisee, her father had to homschool her.

C.The Davidson Academy of Nevada emphasizes social gift more than academic gift.

D.After being enrolled by the academy, Annalisee enjoyed her school life without ant argument with her classmates.小题3:What can you infer from the passage?

A.Annalisee has realized her problem and is gradually changing her attitude towards others.

B.One of the main functions of the gifted education is to provide a good social setting for the highly gifted.

C.Without the academy, Annalisee couldn’t have learnt so much.

D. Like Annalisee, many other smart kids also have the similar trouble.