问题
单项选择题
下列关于光电效应的说法正确的是（）
A.光电效应是光子把部分能量转移给某个束缚电子使之变为光电子的过程
B.光电效应是光子把全部能量转移给原子核使电子变为光电子的过程
C.光电效应是光子把全部能量转移给某个束缚电子使之变为光电子的过程
D.靶物质原子序数低时发生光电效应的几率较高
E.光电效应不需要原子核参与作用
答案
参考答案：C
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下列关于光电效应的说法正确的是（）
A.光电效应是光子把部分能量转移给某个束缚电子使之变为光电子的过程
B.光电效应是光子把全部能量转移给原子核使电子变为光电子的过程
C.光电效应是光子把全部能量转移给某个束缚电子使之变为光电子的过程
D.靶物质原子序数低时发生光电效应的几率较高
E.光电效应不需要原子核参与作用
参考答案：C
Suzie goes to her art class on Tuesday and Thursday afternoons. She always looks forward to those days when she can do things all afternoon. What Suzie likes best is the good feeling she gets when she has finished working on a piece of . And then when she takes it home to her parents, she feels so proud of what she has made. On Wednesday afternoons Suzie writes articles for the newspaper. When she first moved to her new school, she wrote an article about how it feels to be a student in a new school. Her second article in the newspaper was about a(n) from her school who had just finished writing a book. Suzie the teacher what it feels like to be a published author. And then she what she found out with the rest of the school. Another time she wrote an article about why she thought the school should have two short a day instead of a long one. Lots of her friends thought that this would be a good idea too. Many teachers also with Suzie’s suggestion. Would you believe the principal (校长) of the school asked everyone to have a about Suzie’s suggestion? The principal always thinks that students should help decide how the school should be . During the vote, each person in the school voted. At last, the school that two short breaks would be better than one long break. And all of that happened because of Suzie’s suggestion in the school newspaper. On the day the newspaper out each month, the first thing Suzie does is to where her article is in the newspaper. And each time at the beginning of her article are the words: By Suzie Jefferson.
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