若用衍射光栅准确测定一单色可见光的波长，在下列各种光栅常数的_爱下问搜题

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问题单项选择题

若用衍射光栅准确测定一单色可见光的波长，在下列各种光栅常数的光栅中选择 ( )最好。

A．1.0×10^-1mm
B．5.0×10^-1mm
C．1.0×10^-2mm
D．1.0×10^-3mm

答案

参考答案：D

解析：光栅常数越小，衍射效果越好

填空题

选择方框中适当的单词或短语填空。(每词限用一次)

go, at the moment, get to, look after, talk about,
call…for help, check, far from, be careful, go upstairs

1. Don't forget to _______ that computer. It doesn't work.
2. If you have anything in trouble, you can ________ 110 ________.
3. I'll _______ to look for my lost watch.
4. My mother is ill. I have to ________ her at home today.
5. We often ________ that book after school.
6. My home is ________ my school. So I go to school by bus.
7. ________! A car may hit you.
8. — How can I ________ the bus stop?
— Turn left and walk on. It's on your left.
9. — What about ________ shopping with me? — Good idea.
10. They are singing and dancing at the party _______. Let's go and have a look.

名词解释

降滤剂