2022-2022七一英语周报18期答案

34.(15分)(1【答案】故(2分)m4+E(3分)【解析】红光波长最长,频率最小,折射率小于蓝光折射率,所以红光偏折程度最小,靠右边,蓝光偏折程度最大,靠左边;其中一种单色光光路图如图所示,根据对称性可知BC=2,根据几何知识可得OC=√BC+OB=+dF,折射角的正弦值sinrC√元,所以该光的折射率=sini= sini v4d+E【命题意图】考查计算红、蓝两单色光的折射率。(2)解:①波a使得x=0m的质点运动到波谷,运动时间t1=(n+)T(2分)由于0.3s

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

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