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专题14.3电磁振荡和电磁波讲——2023年高考物理一轮复习讲练测(新教材新高考通用)(解析版)_4.2025物理总复习_2023年新高复习资料_一轮复习

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专题14.3电磁振荡和电磁波讲——2023年高考物理一轮复习讲练测(新教材新高考通用)(解析版)_4.2025物理总复习_2023年新高复习资料_一轮复习
专题14.3电磁振荡和电磁波讲——2023年高考物理一轮复习讲练测(新教材新高考通用)(解析版)_4.2025物理总复习_2023年新高复习资料_一轮复习
专题14.3电磁振荡和电磁波讲——2023年高考物理一轮复习讲练测(新教材新高考通用)(解析版)_4.2025物理总复习_2023年新高复习资料_一轮复习
专题14.3电磁振荡和电磁波讲——2023年高考物理一轮复习讲练测(新教材新高考通用)(解析版)_4.2025物理总复习_2023年新高复习资料_一轮复习

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专题 14.3 电磁振荡和电磁波【讲】 【讲核心素养】 1.物理观念: 知道电磁波的发射、传播和接收。认识电磁波谱。知道各个波段的电磁波的名称、特征和典型应用。 2.科学态度与责任: 初步了解麦克斯韦电磁场理论的基本思想,初步了解场的统一性与多样性,体会物理学对统一性的追求。 【讲考点题型】 1.麦克斯韦电磁场理论 变化的磁场能够在周围空间产生电场,变化的电场能够在周围空间产生磁场. 2.电磁波 (1)电磁场在空间由近及远地向周围传播,形成电磁波. (2)电磁波的传播不需要介质,可在真空中传播,在真空中不同频率的电磁波传播速度相同(都等于光速). (3)不同频率的电磁波,在同一介质中传播,其速度是不同的,频率越高,波速越小. (4)v=λf,f是电磁波的频率. 3.电磁波的发射与接收 (1)发射电磁波需要开放的高频振荡电路,并对电磁波根据信号的强弱进行调制(两种方式:调幅、调频). (2)接收电磁波需要能够产生电谐振的调谐电路,再把信号从高频电流中解调出来,调幅波的解调也叫检波. 4.电磁波谱 按照电磁波的频率或波长的大小顺序把它们排列成谱.按波长由长到短排列的电磁波谱为:无线电波、红外 线、可见光、紫外线、X射线、γ射线. 5.电磁波与机械波的比较 名称 电磁波 机械波 项目 产生 由周期性变化的电场、磁场产生 由质点(波源)的振动产生 传播介质 不需要介质(在真空中仍可传播) 必须有介质(真空中不能传播) 波的种类 横波 既有横波也有纵波 由介质和频率决定,在真空中等于光 速度特点 仅由介质决定 速(c=3×108 m/s) 能量 都能携带能量并传播能量 速度公式 v=λf 遵循规律 都能发生反射、折射、干涉、衍射等现象 【方法总结】狭义相对论问题的求解技巧 (1)解决“同时”的相对性问题,可从三个方面入手:①令观测者静止,判断被观测者因相对运动而引起的位置变化. ②结合光速不变原理,分析光传播到两个事件所用的时间. ③光先传播到的事件先发生,光后传播到的事件后发生. (2)“动尺缩短”是指沿运动方向上的长度比其相对静止时测量的长度要短一些,在垂直于运动方向上的长 度没有变化. (3)“动钟变慢”是指两个不同惯性系进行时间比较的结果,也是相对的,即两个惯性系中的观测者都发现 对方的钟变慢了. 【例题】(2022·安徽省临泉第一中学高三开学考试)如图甲所示,在变化的磁场中放置一个闭合电路,电 路里产生了感应电流;如图乙所示,空间存在变化的磁场,其周围产生感应电场,下列说法正确的是( ) A.甲、乙两图一定能持续产生电磁波 B.对甲图,从上向下看,电子在回路中沿顺时针方向运动 C.闭合电路只是检验变化的磁场产生电场,即使没有闭合电路空间仍能产生电场 D.变化的电场周围产生磁场,与闭合电路是否存在有关 【答案】 C 【解析】A.若甲、乙两图的磁场均匀变化,就会产生稳定不变的电场,稳定不变的电场不会产生磁场, 就不会持续产生电磁波,故A错误; B.对甲图,从上向下看,感应电流沿顺时针方向,电子在回路中沿逆时针方向运动,故B错误: C.变化的磁场周围产生电场是一种普遍存在的现象,与闭合电路是否存在无关,甲图的闭合电路只是检 验变化的磁场产生电场,乙图即使没有闭合电路空间仍能产生电场,故C正确: D.同理,变化的电场周围产生磁场也是一种普遍存在的现象,与闭合电路是否存在无关,D错误。 故选C。 【素养提升】本题考察的学科素养主要是物理观念。 【变式训练1】(2022·重庆·临江中学高三开学考试)在理想LC振荡电路中的某时刻,电容器极板间的场 强E的方向如图所示,M是电路中的一点。若该时刻电容器正在充电,据此可判断此时( )A.电路中的磁场能在增大 B.流过M点的电流方向向左 C.电路中电流正在增加 D.电容器两板间的电压在减小 【答案】 B 【解析】AC.因该时刻电容器正在充电,则电流逐渐减小,电路中的磁场能在减小,故AC错误; B.该时刻电容器正在充电,此时电容器上极板带正电,则充电时流过M点的电流方向向左,故B正确; D.充电时,电容器两板间的电压在增大,故D错误。 故选B。 【必备知识】对麦克斯韦电磁场理论的理解
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  1. CONNECT:[ UseTime:0.001052s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001503s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000880s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000657s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001364s ]
  6. SELECT * FROM `set` [ RunTime:0.000546s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001540s ]
  8. SELECT * FROM `wendang` WHERE `id` = 368071 LIMIT 1 [ RunTime:0.001137s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 368071 [ RunTime:0.022068s ]
  10. UPDATE `wendang` SET `lasttime` = 1773074066 WHERE `id` = 368071 [ RunTime:0.001276s ]
  11. SELECT * FROM `wendang` WHERE `id` < 368071 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001171s ]
  12. SELECT * FROM `wendang` WHERE `id` > 368071 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004357s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 368071 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002380s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 368071 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005768s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 368071 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003258s ]
0.217101s