问题 问答题

(选修模块3-5)

(1)下列说法中正确的是______

A.普朗克在研究黑体辐射问题时提出了能量子假说

B.光电效应、康普顿效应说明光具有粒子性

C.α粒子散射实验证明了原子核是由质子和中子组成的

D.天然放射现象的发现揭示了原子的核式结构

(2)请将下列两个核反应方程补充完整.

 42
He+
 147
N→
 178
O+______       ②
 23592
U+
 10
n→
 14054
Xe+
 9438
Sr+______

(3)在2010年温哥华冬奥会上,首次参赛的中国女子冰壶队喜获铜牌,如图为中国队员投掷冰壶的镜头.假设在此次投掷中,冰壶运动一段时间后以0.4m/s的速度与对方的静止冰壶发生正碰,碰后中国队的冰壶以0.1m/s的速度继续向前滑行.若两冰壶质量相等,则对方冰壶获得的速度为______ m/s.

答案

(1)A、普朗克在研究黑体辐射问题时提出了能量子假说,故A正确

B、光电效应、康普顿效应说明光具有粒子性,故B正确

C、α粒子散射实验的结果证明原子的核式结构,故C错误

D、然放射现象的发现揭示了原子核具有复杂的结构,故D错误

故选AB.

(2)①

 42
He+
 147
N→
 178
O+
 11
H      ②
 23592
U+
 10
n→
 14054
Xe+
 9438
Sr+2
 10
n

(3)设冰壶的质量为m,冰壶碰撞过程中动量守恒,根据动量守恒定律得:

mv0=mv1+mv2

解得:v2=0.3m/s

故答案为:(1)AB;(2)

 11
H,2
 10
n(3)0.3

选择题
阅读理解

Speaking in his first National Day Rally speech on 15 August, Prime Minister Lee Hsien said Singapore’s education system was set for more reforms in the years ahead, particularly for the primary and secondary education.Read the summary of his thoughts on education below.

For a start, the Government is prepared to send and additional 3,000 teachers to Singapore schools, cut the courses of study even further and change the way the mother tongue, especially Chinese, is taught.But, for the changes to be successful, parents need to help.

Singapore has a devoted group of teachers and principals and quite a few of them are outstanding, but the Republic’s schools can be even better.To help the schools make a jump in quality, the Government plans that within the next 6 years, it will send 1,000 more teachers to primary schools, 1,400 to secondary schools and 550 more to junior colleges.Each school would decide how to use its extra teachers.Some may want to make classes smaller so students get more individual attentions while others may have new teachers assist more senior teachers, but the overall goal is to give teachers the time and space to come up with ways to bring out the best in their students.

More teachers must not mean more homework, however.In fact, the Prime Minister wants to see the courses cut down so that there is less pressure on the students.Good grades are important but they should not be the only goal students have.PM Lee is convinced that “we must teach less so that our children can learn more.”

Another change will be in the teaching of the mother tongue so that students can become more fluent.The key is to teach Chinese as a living language not just an academic subject like Latin.Therefore, the focus should be on speaking and reading the language.To do this, there must be an environment outside the classroom that is contributing to strengthening the Chinese lessons.

小题1:The text is mainly about         in Singapore.

A.the education reform

B.adding more teachers

C.the mother tongue

D.ways of teaching小题2:The general goal of using extra teachers is to          

A.make classes smaller

B.assist more senior teachers

C.teach more

D.help teachers improve teaching quality小题3:PM Lee holds that the students should         

A.do more homework

B.give up higher grades

C.study more courses

D.be given more time to learn more小题4:The key to teaching Chinese well is to          

A.make it academic

B.have a creative environment

C.give more Chinese lessons

D.encourage speaking and reading a lot