5、对光电效应的解释正确的是( )
A.金属内的每个电子要吸收一个或一个以上的光子,当它积累的能量足够大时,就能逸出金属
B.如果入射光子的能量小于电子脱离某种金属所做功的最小值,便不能发生光电效应
C. 发生光电效应时,若入射光越强,则光子的能量就越大,光电子的最大初动能就越大
D.由于不同金属的逸出功是不同的,因此使不同金属发生光电效应的入射光的最低频率也不同
4、在演示光电效应的实验中,原来不带电的锌板与验电器相连,用紫外线灯照射锌板时,验电器的指针张开一定的角度,如图所示,以下说法正确的是( )
A. 锌板带正电,指针带负电
B. 锌板带正电,指针带正电
C. 锌板带负电,指针带正电
D. 锌板带负电,指针带负电
3、经150V电压加速的电子束,沿同一方向射出,穿过铝箔后射到其后的屏上,则( )
A. 所有的电子运动轨迹都相同
B. 所有的电子到达屏上的位置坐标都相同
C. 电子到达屏上的位置坐标可用牛顿运动定律确定
D. 电子到达屏上的位置受波动规律支配,无法用确定的坐标来描述它的位置
2、根据课本黑体辐射的实验规律,以下判断正确的是( )
A.在同一温度下,波长越短的电磁波辐射强度越大
B.在同一温度下,辐射强度最大的电磁波波长不是最大的,也不是最小的,而是处在最大与最小波长之间
C.温度越高,辐射强度的极大值就越大
D. 温度越高,辐射强度最大的电磁波的波长越短
1、下列说法中正确的是( )
A. 质量大的粒子,其德布罗意波长小
B. 速度大的粒子,其德布罗意波长小
C. 动量大的粒子,其德布罗意波长小
D. 动能大的粒子,其德布罗意波长小
每年的6月22日是世界慈善日(Charity Day),2009年镇江市“爱在镇江,慈善一日捐”活动的主题是关爱青少年儿童白血病患者(leukemia patient)。现在请你以学生会的名义写一份倡议书,内容要点如下(括号中的词汇可供参考):
1.越来越多的孩子因患病而上不起学;(because of)
2.他们家庭没有足够的钱为他们治疗;(not enough money to)
3.每个孩子都应该拥有健康和上学的权力;(have the rights to do something)
4. 我们应该做一些力所能及的事去帮助他们,比如……;(as possible as one can)
5. 希望他们和我们一样获得健康,并能重返校园,享有在学校获得知识的机会。
(come back to,get knowledge)
6. 可适当发挥想象,提出自己的建议。
注意:1.文章开头、结尾已给出,但不计人总词数;
2.词数:80左右。
Dear students,
In some parts of our city, there are more and more children out of school
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Thanks for your joining!
Students' Union
江苏省苏州市2009年中考英语模拟试卷
A 10-year-old school boy named Bian Jinyang, has made himself well-known by w 66 stories like Harry Potter’s.
Bian Jinyang, Junior 1 student has written two books Shiguang Moqi and Qinren Buluo. The first book has sold more than 120,000 c 67 in China and a third one, Touzhong Jiaoqing, will come o 68 soon.
Just like the Harry Potter stories, Bian’s stories are a 69 magic. But they do not take place in a magic school. They may h 70 in any corner of the world. Or even in outer s 71 In Qinren Buluo, Emperor Qin Shihuang sends 1, 000 boys and girls to Japan, but aliens(太空人) take them to a 72 planet. Then a kid tries to take them b 73 to Earth.
“People say I don’t have experience in life because I’m young.” He said, “They are r 74 . But just because of that I can write stories like these, I can think about things that adults can’t think of!”
Now a company in the US has p 75 Bian $150,000 for the right(权力) to put his first book in English in America.
66._________ 67._________ 68.________ 69._________ 70.________
71._________ 72._________ 73. ________ 74. ________ 75. ________
64._______ (太阳镜)help to protect our eyes in summer.
a is _______ (发展) faster and faster these years.