2019-2020年高二下学期第12周定时训练物理试题缺答案

1、2019-2020年高二下学期第12周定时训练物理试题缺答案1 .下列说法正确的是.康普顿效应中，当入射光子与晶体中的电子碰撞时，把一部分动量转移给电子，因此, 光子散射后波长变长将放射性元素掺杂到其他稳定元素中，并降低其温度，它的半衰期会改变玻尔的原子结构理论是在卢瑟福核式结构学说上引入了量子理论氢原子的核外电子从距核较近的轨道跃迁到距核较远轨道的过程中，原子吸收能量, 电子的动能减小，原子的电势能增大在黑体辐射中随着温度的升高，一方面各种波长的辐射强度都会增加；另一方面辐射强度的极大值向波长较长的方向移动（15分）（1）（6 分）下列说法正确的是 原子的核式结构是汤姆孙发现的铀核（1?U）

2、衰变为铅核（ 206Pb）的过程中，要经过8次a衰变和6次B衰变一个氢原子从量子数n= 3的激发态跃迁到基态时最多可产生2条不同频率的谱线束光照射到某种金属上不能发生光电效应，可能是因为这束光的光强太小用加热、加压或改变其化学状态的方法都不能改变原子核衰变的半衰期（9分）如图所示，质量均为 m可视为质点的 A B两物体紧挨着放在水平面上的O点,1左边有竖直墙壁 M右边在N点与光滑的、半径为 R的；4圆弧槽相连，MO= ON= RA物体与水平面间的摩擦力忽略不计，B物体与水平面间的动摩擦因数为 0.5.开始时两物体静止.现 让A物体以初速度V0向左开始运动，设A与竖直墙壁、A与B均发生无机械能损

3、失的碰撞. 已 知重力加速度为g.要使B物体第一次被 A碰撞后，恰能上升至圆弧槽最高点 P点，求：A物体的初速度V。为多少？B物体最终停在何处？（15分）（1）（6 分）大量氢原子由n= 4的能级向基态跃迁.其中从 n= 4向n= 2跃迁时的氢原子辐射的光子恰好能使某金属发生光电效应，则（）跃迁过程中可放出 4种光子跃迁过程中可放出 6种光子跃迁产生的光子中，有 2种能使该金属发生光电效应跃迁产生的光子中，有 4种能使该金属发生光电效应（2）（9分）一质量为M的木块，静止在光滑的水平面上.另有一质量为 m的子弹以水平速度vo击中并射穿该木块.测得子弹刚射穿木块后的速度为若将此木块固定在水平地面

4、上，3子弹仍以原来的速度击中并射穿木块，子弹与木块间阻力不变， 求子弹射穿木块后的速度.恥1V0-0.54-).51-3.40（15分）（1）（6分）如图为氢原子的能级图，大量处于n = 5激发态的氢原子跃迁时，可能发出 种能量不同的光子，其中频率最大的光子能量为 eV,；若用此光照射到逸出功为3.06 eV的光电管上，则加在该光电管上的反向遏止电压为V.2-13,6（9分）如图所示，质量均为 m的小滑块P和Q都可视为质点，与轻质弹簧相 连的Q静止在光滑水平面上.P以某一初速度vo向Q运动并与弹簧发生碰撞， 在 整个过程中，弹簧具有的最大弹性势能等于多少？P最终的运动速度为多少？5. (15分

5、)(1)(6 分)下列说法正确的是( ) a粒子大角度散射表明a粒子很难进入原子内部极限频率越大的金属材料逸出功越大聚变反应有质量亏损，质量数不守恒丫射线是一种波长很短的电磁波82S尸836Kr + 2-0e是重核裂变(2)(9分)质量为M的滑块由水平轨道和竖直平面内的四分之一光滑圆弧轨道组成，放在光滑的水平面上滑块开始时静止，质量为m的物块从圆弧轨道的最高点由静止开始滑下，以速度v从滑块的水平轨道的左端滑出，如图所示已知M： m= 3 : 1，物块与水平轨道之间有摩擦u,圆弧轨道的半径为 R 求物块从轨道左端滑出时，滑块M的速度的大小；求水平轨道的长度。 若滑块静止在水平面上，物块从左端冲上

6、滑块，要使物块m不会越过滑块，求物块 冲上滑块的初速度 V。应满足的条件.E/cV -0.85 -LSI -340113.66. (15分)(1)(6 分)下列说法中正确的是 .A.卢瑟福通过实验发现质子的核反应方程为2He+ 17nr 18o+1h放射性元素的半衰期随温度的升高而增加 一个动量为p的电子对应的物质波波长为hp(h为普朗克常量)从能级图4可知，氢原子从n= 2能级跃迁到n= 1能级释放出的光子能量高于从n= 4能级跃迁到n =2能级所释放出的光子能量在光电效应中，对于某种金属，超过其极限频率的入射光频率越高，所产生的光电子的最大初动能就越大（9 分）如图所示，在高为h = 5

7、m的平台右边缘上，放着一个质量M= 3 kg的铁块，现有一质量为 m= 1 kg的钢球以vo= 10 m/s的水平速度与铁块在极短的时间内发生正碰后被 反弹，落地点距离平台右边缘的水平距离为x= 2 m已知铁块与平台之间的动摩擦因数为卩=0.4，重力加速度为 g= 10 m/s2,已知平台足够长，求铁块在平台上滑行的距离1（不计空气阻力，铁块和钢球都看成质点）h含答案2019-2020年高二下学期第12周定时训练英语试题When I was seven years old, my family made me an ant farm. First, we put clean sand in a

8、 thin glass box. Then we waited for the ants to arrive.地道）.IAfter the an ts were in the glass farm, they started to make tunn els （ was amazed that each one knew exactly what to do. Each had its own job.On the fifth day a tragedy （悲居U） happened. I put my face so close to the glassfarm that I kn ocke

9、d it over. All the tunn els fell dow n. Although the ants rema inedalive after their earthquake, one by one they began to die. I was scared as I watched them give up buildi ng their tunn els to carry the bodies to a corner of the farm.My mother said that the ants were dying of sad ness. They simply

10、could not sta ndthat their tunn els were gone.Although much time has passed, I still think of that ant farm. Mom had hoped itwould teach me about the n atural world, but it taught me much more.Over the years, I came to realize the importa nee of teamwork. Work ing together, theants were able to make

11、 an amaz ing world for themselves. I also lear ned that theyshould be admired （ 钦佩）for their hard work.But there was an eve n larger less on that I did not realize un til recen tly:Adversity（ 逆境）is a n atural part of life, and must be accepted. Un like the an ts,we cannot give up whe n we are sad. W

12、e have to realize that if a tunnel is gone, we must build ano ther.Giving up, I say, is not a good choice.What did the writers family do for him when he was seven?They built a farm of ants.B. They bought a few ants.C. They caught a lot of ants.D. They found an ant city.Which statement is TRUE accord

13、ing to the passage?The writer broke the glass box because it made his face dirty.The ants died one by one because the tunnels were destroyed.Unlike people, teamwork is not so important for the ants.Giving up is a good way when we meet trouble.Which is the correct order of the following?All the tunne

14、ls fell down.B. The ants died one by one.C. The ants got into the glass box.D. The ants began making tunnels.a-b-c-dB. a - c - d - b C. c-d-a-b D. c-a-d-bWhat did the writer e to realize a few years later?Working together is useless.B. Teamwork is important.C. He cant accept adversity.D. Working alo

15、ne is amazing.What is the best title for the passage?Ants Fear AdversityB. My Family and AntsC. Giving Up in Adversity D. A Good Lesson from Ants(B)The dodo was a large bird that you might not think was a bird at all, for the dodo could not fly. It was a member of the chicken family. The bird was di

16、scovered by European sailors in 1507 on Mauritius(毛里求斯 ) Island.Whenthe sailors talked about the strange bird that could not fly, you can imagine people found it hard to believe their story. The Europeans who settled on Mauritius Island and the pigs they brought with them found the birds very good t

17、o eat. So large numbers of dodoes were killed and by 1681 no living dodoes were found on the island. A few dodoes were brought to England in the 17th century, but for 200 years none have been seen alive. This is the reason for the phrase “ as dead as a dodo” .Because they died out pletely, the dodoe

18、s became very well-known.The writer tells us that the dodo .existed between 1507 and 1681B. has existed since 1507C. doesn t exist nowD. may have existedWhat was so unusual about dodoes as a bird?They looked like birds but couldn t fly.They lived longer than other birds.They were very good to eat.D.

19、 They were all killed.Dodoes are no longer seen on Mauritius Island because they .A. were killed by pigswere all taken to Englandhave been driven away by the settlershave all been killed for fooddescribe something thatThe phrase “ as dead as a dodo ” is sometimes used toA. cannot protect itself from

20、 being eatencannot fly or move fastno longer existsis sure to dieFrom the second paragraph, whose story did people find it hard to believe?A. The EuropeansC. The se ttlersThe dodoes .D. The sailors(C)When her five daughters were young, Helene An always told them that there was strength in unity (团结

21、). To show this, she held up one chopstick, representing oneperson. Then she easily broke it into two pieces. Next, she tied several chopsticks together, representing a family. She showed the girls it was hard to break the tied chopsticks. This lesson about family unity stayed with the daughters as

22、they grew up.Helene An and her family own a large restaurant business in California. However,when Helene and her husband Danny left their home in Vietnam in 1975, they didnt have much money. They moved their family toSan Francisco. There they joined Dannysmother, Diana, who owned a small Italian san

23、dwich shop. Soon afterwards, Helene and Diana changed the sandwich shop into a small Vietnamese restaurant. The five daughters helped in the restaurant when they were young. However, Helene did not want her daughters to always work in the family business because she thought it was too hard.Eventuall

24、y the girls all graduated from college and went away to work for themselves, but one by one, the daughters returned to work in the family business.They opened new restaurants in San Francisco and Los Angeles. Even though family members sometimes disagreed with each other, they worked together to mak

25、e the business successful. Daughter Elisabeth explains, Our mother taught us that to succeed we must have unity, and to have unity we must have peace. Without the strength of the family, there is no business.Their expanding business became a large corporation in 1996, with three generations of Ans w

26、orking together. Now the Ans corporation makes more than $20 million each year. Although theybegan with a small restaurant, they had bigdreams,and they worked together. Now they are a big success.Helene tied several chopsticks together to show .A. the strength of family unityB. the difficulty of gro

27、wing upthe advantage of chopsticksD. the best way of giving a lessonWe can I earn from Paragraph 2 that the An family .A. started a business in 1975B. left Vietnam without much moneyC. bought a restaurant in San FranciscoD.opened a sandwich shop inLos AngelesWhat can we infer about the An daughters?

28、A. They did not finish their college education.They could not bear to work in the family business.They were influenced by what Helene taught them.They were troubled by disagreement among family members.Which of the following can be the best title for the passage?A. How to Run a Corporation B. Streng

29、th es from PeaceC. How to Achieve a Big DreamD. Family Unity Builds Success（D）As Internet users bee more dependent on the Internet to store information, arepeople remembering less? If you know your puter will save information, why store it in your own personal memory, your brain? Experts are wonderi

30、ng if the Internet is changing what we remember and how.In a recent study, Professor Betsy Sparrow conducted some experiments. She and her research team wanted to know the Internet is changing memory. In the first experiment, they gave people 40 unimportant facts to type into a puter. The first grou

31、p of people understood that the puter would save the information. The second group understood that the puter would not save it. Later, the second group remembered the information better. People in the first group knew they could find the information again, so they did not try to remember it.In anoth

32、er experiment, the researchers gave people facts to remember, and told them where to find the information on the Internet. The information was in a specific puter folder （ 文件夹 ）. Surprisingly, people later remember the folder location （位置 ） better than the facts. When people use the Internet, they d

33、o not remember the information. Rather, they remember how to find it. This is called transactive memory （ 交互记忆 ）According to Sparrow, we are not being people with poor memories as a result of the Internet. Instead, puter users are developing stronger transactive memories; that is, people are learnin

34、g how to organize huge quantities of information so that they are able to access it at a later date. This doesnt mean we are being either more or less intelligent, but there is no doubt that the way we use memory is changing.The passage begins with two questions to .A. introduce the main topicB. sho

35、w the authors attitudeC. describe how to use the Internet.D. explain how to storeinformationWhat can we learn about the first experiment?A. Sparrows team typed the information into a puter.The two groups remembered the information equally well.The first group did not try to remember the information.

36、The second group did not understand the information.In transactive memory, people .A. keep the information in mindB. change the quantity of informationC. organize information like a puterD. remember how to find theinformationWhat is the effect of the Internet accord ing to Sparrows research?A. We ar

37、e using memory differe ntly.B. We are being more in tellige nt.C. We have poorer memories than before.D. We need a better way to accessin formati on.（E）根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。I was ten whe n I first sat with my gra ndmother beh ind the cashier（收银台）inher gen eral store. 71 I quickly

38、 lear ned the importa nee of treati ng customers politely and saying“thank you. ”At first I was paid in candy. 72 I worked every day after school, and during the summer and on weeke nds and holidays from 8 a.m. to 7 p.m. My father helped me set up a bank acco unt. 73By the time I was 12, My gran dmo

39、ther thought I had done such a good job that shepromoted meto selling cosmetics （化妆品） .I developed the ability to look customers directly in the eye. Eve n though I was just a kid, wome n would ask me such thingsas “ What color do you think I should wear?” I took a real interest in their questions a

40、nd was able to tran slate what they wan ted into makeup（化妆）ideas. 74The job taught me a valuable less on: to be a successful salespers on, you did n t n eed to be a Rocket scie ntist you n eeded to be a great liste ner.expect theyare NO Ion ger wome n purchas ing cosmetics from me; in stead, they are kids who tell me which toys they would like to see designed and developed.Later I received 50 cents an hour.Before long, she let me sir there by myself.I en ded my sell ing a record amount of cosmetics.Today I still carry that less on