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【多选题】
下列关于可见光的范围的说法中,正确的有A.
可见光的波长最长的是700nm左右
B.
可见光的波长最短的是100nm左右
C.
在可见光谱中,波长最短的光波是紫
D.
在可见光谱中,波长最长的光波是红
E.
黄色光波范围在580~600nm左右
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皮皮学刷刷变学霸
举一反三
【简答题】光与物质相互作用时，会被介质吸收或放大。被吸收时，光强会减弱，放大时说明介质对入射光有增益。请问增益系数是与原子相关的哪个物理量成正比？这个物理量在激光的产生过程中扮演什么角色？
【简答题】若[X]补=1000,则X= () 。
【单选题】Which of the following is a disadvantage of the strategy employed in the experimental scholarly methods course?
A.
Students were not given an opportunity to study women writers outside the canon.
B.
Students had little background knowledge for further research.
C.
Most of the students in the course had had little opportunity to study 18th century literature.
D.
Students were not given an opportunity to encounter certain sources of information that could prove useful in their future studies.
【简答题】若[x]补=1000,则x=( )。
【简答题】若[x]补＞[y]补，是否有x＞y?
【单选题】According to the author the disadvantage of using paper to keep and send information is that ______.
A.
it is hard to get enough paper
B.
it wastes our time
C.
it damages the environment
D.
there is too much paper around
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