2022衡水金卷先享题二轮复习答案

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34.(1)BCD(2)①√2②πR3[(1)每个点起振的方向就是波源起振的方向，因此波源起振的方向沿y轴正方向，A错误；由图可知，波长入=8，根据)=入f,可知波源振动的频率f=1Hz,B正确；质点每振动一个周期，波向前传播一个波长，因此t=9.25s时，波向前传播了9入，此时x=13m处的质点，恰好位于正向最大位移处，因此位移为5cm,C正确；波每经过一个周期，质点运动4倍振幅，因此20s内，x=13m处的质点通过的路程s=20×4×0.05m=4m,D正确；t=20s时，波传播的距离△x=t=160m,而初始位置在x1=13m处，因此波刚好传播到x=173m处，E错误。(2)①光由空气进入透明柱体，入射角01=45°折射角02=30°(1分)根据折射定律得n=sind(2分)sin02解得n=√2(1分)②在图中作出三条折射光线，过平面右边界的、过圆心的和在弧面恰好M发生反射的，如图所示。即圆弧DFE部分能透射出光。KB由∠OBA=45°，∠EBA=60°可得∠OBE=15°(1分)G根据几何关系知∠OEB=15°，∠FOE=151根据全反射知识可知n=sin∠ADO(2分)解得∠ADO=45°(1分)所以∠DOE=60°(1分)则圆弧DFE的长度s=6·2πR=πR(1分]3

第二节书面表达【写作思路】根据试题要求,考生需要写一篇记叙文,记述身边一位值得尊敬和爱戴的人。首先考生需要介绍自己最尊敬和爱戴的人是谁,简单地介绍一下他(她)。然后,陈述为什么他(她)值得尊敬和爱戴。最后,可以对前文进行一个总结,使文章结构严谨。本文的写作重点在"尊敬和爱戴的原因",考生可围绕这个要点适当拓展,从性格特点、处事风格等方面展开写作。【范文赏读】The most beloved and respected person around me is my teacher, Ms LiThough she has been teaching English for twenty years, she is still passionateabout teaching. She is kind and considerate towards us just like our dear motherWe all respect her because she always tries new ways to make her classes livelyand interesting. Hardworking and knowledgeable, she is one of the best teachersin our school. When we have a problem, we will turn to her for help. She alwaystalks to us patiently and helps us to find a solution. In our eyes, she is not onlyour teacher, but also our best friend. Those are why she deserves our respect【亮点词句】亮点词汇: beloved, respected, be passionate about, be consideratetowards, turn to sb. for help, in one's eyes亮点句式:Why引导的表语从句( why she deserves our respect)