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1、大学物理大物课后答案大学物理大物课后答案 练习十五练习十五 光的偏振光的偏振1、B 2、C 3、 4、1.732 5、 o450323I6、完全偏振光 垂直入射面 部分偏振光 7、解：（1）透过第一个偏振片后的光强1I2 100cos 303/4IIIo透过第二个偏振片后的光强为，2I2 210cos 603/16IIIo（2）原入射光束换为自然光，则10/2II2 210cos 60/8IIIo8、解：设第二个偏振偏与第一个偏振片的偏振化方向间的夹角为. 透过第一个偏振片后的光强 10/2II透过第二个偏振片后的光强为，由马吕斯定律，2I2 20(/2)cosII透过第三个偏振片后的光强为3
2、I2222 3200cos (90)(/2)cossin(/8)sin 2IIIIo由题意知 03323II 所以 432sin2 30 ,60oo9、解：设入射光光强为，自然光光强为 ，线偏振光光强为,透射光光强为IzIxItI由题意 入射光 透射光xIIzI 2cos21xztIII xztIII 21maxztII21min minmax5ttII 解得 IIIIzx31 32 10、解：设两光源光强分别为，由马吕斯定律得经过两偏振片后光强21II 、222 2121 18160cos28330cos2IIIIII oo由题意 则有21II 3121 II以下是大学体验英语综合教程 2(
3、第三版)课后翻译答案Unit1 1. 任何年满 18 岁的人都有资格投票。(be eligible to, vote)Answer:Anyone over the age of 18 is eligible to vote. 2. 每学期开学前，这些奖学金的申请表格就会由学校发给每一个学生。(apply for, scholarship) Answer:A form to apply for these scholarships is sent by the university to every student before the start of every semester. 3. 遵
4、照医生的建议，我决定戒烟。(on the advice of)Answer:On the advice of my doctor, I decided to give up smoking. 4. 公园位于县城的正中央。(be located in)Answer:The park is located right in the center of town. 5. 这所大学提供了我们所需的所有材料和设备。(facilities) Answer:The university provides all the materials and facilities we desire.1. 他们花了多年
5、的时间寻找内心的平静，但是收效甚微。(search for)Answer:They spent many years searching for peace of mind, but with little success. 2. 这种新药的成功研制已经使许多疾病的治疗发生了根本性的变革。(revolutionize)Answer:The successful development of the new drug has revolutionized the treatment of many diseases. 3. 由于这个国家的经济不景气，这家公司濒于破产。(on the edge o
6、f)Answer:The company is on the edge of bankruptcy due to the economic depression in the country. 4. 大学毕业后他成为了一名护士。他认为护士这一职业可能很有发展前途。(rewarding)Answer:He became a nurse after college. He thought nursing could be a very rewarding career. 5. 他像往常一样在文件上签了名。(just as) Answer:He signed his name on the pape
7、r just as he has always done it.Unit2 1. 警察们正忙着填写关于这场事故的各种表格。(fill out)Answer:The policemen are busy fi lling out forms about the accident. 2. 我想在还车之前把油箱加满。(fill up, fuel tank)Answer:I want to fi ll up the fuel tank before returning the car. 3. 如果你要投诉，最好遵循正确的程序。(follow the procedure)Answer:If you wa
8、nt to make a complaint, youd better follow the correct procedure. 4. 要不是约翰帮忙，我们绝不会这么快就完成实验。(without)Answer:We couldnt have fi nished the experiment so soon without Johns help. 5. 暴风雨之后，岸边的人们焦急地搜索湖面以期发现小船的踪迹。(scan for)Answer:After the storm, the people on the shore anxiously scanned the lake for any
9、sign of the boat.1. 这个国家不大，但是在国际事务中它却发挥着重要作用。(play a role)Answer:This country is not big, but it plays an important role in international affairs. 2. 正是在我叔叔的帮助下，我得以克服困难，按时完成了任务。(it is . that)Answer:It was with the help of my uncle that I overcame the difficulty and completed the assignment in time.
10、3. 毕业时他决定留在北京，而他最好的朋友却选择了去西藏。(while)Answer:While he decided to stay in Beijing upon graduation, his best friend chose to go to Tibet. 4. 在这次校园英语演讲比赛中，我们班的玛丽获得了第三名。(come in)Answer:In this Campus English Speaking Contest, Mary from our class came in third. 5. 你应该知道学习弹钢琴需要有时间，有金钱，还要有毅力。(as well as) Ans
11、wer:You should know that it takes time, money as well as perseverance to learn to play the piano.Unit3 1. 我发现量入为出地过日子越来越难了。(increasingly) Answer:I find it increasingly difficult to live within my income. 2. 现代政治家们都试图以电视讲话来影响普通百姓。(reach out) Answer:Modern politicians try to reach out to ordinary peop
12、le in their TV speeches. 3. 应该帮助学生对人生采取积极的态度。(adopt) Answer:Pupils should be helped to adopt a positive attitude to life. 4. 希望全班同学参加这些讨论。(participate in) Answer:Everyone in the class is expected to participate in these discussions. 5. 如果你犯了罪就必须受到惩罚。(crime) Answer:If you commit a crime you must expe
13、ct to be punished.1.儿子的死让老妇人变得麻木痴呆了。(numb)Answer:The old woman was numbed by her sons death. 2.身处所有这些烦恼之中，他依然能保持乐观。(in the midst)Answer:In the midst of all troubles, he managed to remain cheerful. 3. 虽有困难，他们还是设法坚持试验下去。(carry on) Answer:They managed to carry on their experiments in spite of the diffi
14、culties. 4.我们必须淘汰不合格的申请人。(weed out) Answer:We have to weed out unqualified applicants. 5. 医生要他减少抽烟。(cut down on) Answer:The doctor told him to cut down on smoking.Unit4 1.她在公共汽车站一直等到末班车进站。(come in) Answer:She waited at the bus stop until the last bus came in. 2.如果我们能帮得上忙，尽管和我们联系。(contact) Answer:If
15、there is any way we can be of assistance, please do not hesitate to contact us. 3 .他需要多少船务人员才能使他的游艇航行？(crew, yacht) Answer:How many crew does he need to sail his yacht? 4 .虽然她的新书没有上一本好，但是我还是喜欢它。(not quite as) Answer:I enjoyed her new book though its not quite as good as her last one. 5 .我从未遇到过如此善良的人
16、。(never before) Answer:Never before have I met such a kind person. 1.公共汽车放慢速度并停下，让那位乘客上车。(slow down) Answer:The bus slowed down and stopped to allow the passenger to get on board. 2.许多车子都驶过去了，可是没有一辆愿意让我们搭便车。(roll by) Answer:Many vehicles rolled by, but no one offered us a ride. 3 .请勿践踏草地。(get off) Answer:Ple
