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第13章第3练 电磁振荡与电磁波_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_一轮复习85练

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第13章第3练 电磁振荡与电磁波_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_一轮复习85练
第13章第3练 电磁振荡与电磁波_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_一轮复习85练
第13章第3练 电磁振荡与电磁波_4.2025物理总复习_2024年新高考资料_1.2024一轮复习_2024年高考物理一轮复习讲义(新人教版)_学生版在此文件夹_一轮复习85练

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1.(2023·北京市模拟)使用蓝牙耳机可以接听手机来电,蓝牙通信的电磁波波段为(2.4~ 2.48)×109 Hz.已知可见光的波段为(3.9~7.5)×1014 Hz,则蓝牙通信的电磁波( ) A.是蓝光 B.波长比可见光短 C.比可见光更容易发生衍射现象 D.在真空中的传播速度比可见光小 2.(2023·辽宁锦州市模拟)5G是“第五代移动通信技术”的简称,其最显著的特点之一为具 有超高速的数据传播速率,5G信号一般采用3.3×109~6×109 Hz频段的无线电波,而第四 代移动通信技术4G采用的是1.88×109~2.64×109 Hz频段的无线电波,则下列说法正确的 是( ) A.空间中的5G信号和4G信号相遇会产生干涉现象 B.5G信号比4G信号所用的无线电波在真空中传播得更快 C.5G信号相比于4G信号更不容易绕过障碍物,所以5G通信需要搭建更密集的基站 D.5G信号比4G信号波长长 3.(2023·上海市杨浦高级中学模拟)下列关于电磁波的特性和应用的说法正确的是( ) A.电磁波能传输能量 B.γ射线最容易用来观察衍射现象 C.紫外线常用在医学上做人体透视 D.体温超过周围空气温度时,人体才对外辐射红外线 4.(多选)(2023·天津市模拟)下列说法正确的是( ) A.LC电路产生电磁振荡的过程中,回路电流值最小时刻,磁场能最小 B.变化的电场一定产生变化的磁场 C.无线电波发射接收过程中,使接收电路产生电谐振的过程叫作调谐 D.空调遥控器是利用发射紫外线来控制空调的 5.(多选)下列关于无线电广播要对电磁波进行调制的原因的说法中正确的是( ) A.经过调制后的高频电磁波向外辐射能量的本领更强 B.经过调制后的电磁波在空间传播得更快 C.经过调制后的电磁波在空间传播的波长不变 D.经过调制后的电磁波在空间传播的波长改变 6.(多选)下列关于无线电波的叙述中,正确的是( )A.无线电波是波长从几十千米到一毫米的电磁波 B.无线电波在任何介质中的传播速度均为3.0×108 m/s C.无线电波不能产生干涉和衍射现象 D.无线电波由真空进入介质传播时,波长变短 7.(2023·山东泰安市模拟)关于电磁波谱,下列说法中正确的是( ) A.红外体温计的工作原理是人的体温越高,发射的红外线越强,有时物体温度较低,不发 射红外线,导致无法使用 B.紫外线的频率比可见光低,医学中常用于杀菌消毒,长时间照射人体可能损害健康 C.X射线、γ射线频率较高,波动性较强,粒子性较弱,较难发生光电效应 D.手机通信使用的是无线电波,其波长较长,更容易观察到衍射现象 8.在LC振荡电路中,电容器上的带电荷量从最大值变化到零所需的最短时间是( ) A. B. C.π D.2π 9.如图甲所示,“救命神器”——自动体外除颤仪(AED)现在已经走入了每个校园,它是 一种便携式的医疗设备,可以诊断特定的心律失常,并且给予电击除颤,是可被非专业人员 使用的用于抢救心脏骤停患者的医疗设备.其结构如图乙所示,低压直流经高压直流发生器 后向储能电容器C充电.除颤治疗时,开关拨到2,将脉冲电流作用于心脏,使患者心脏恢 复正常跳动,其他条件不变时,下列说法正确的是( ) A.脉冲电流作用于不同人体时,电流大小相同 B.放电过程中,电流大小不变 C.电容C越小,电容器的放电时间越长 D.自感系数L越小,电容器的放电时间越短 10.(多选)LC振荡电路中,某时刻磁场方向如图所示,则下列说法正确的是( )A.若磁场正在减弱,则电容器上极板带正电 B.若电容器正在放电,则电容器上极板带负电 C.若电容器上极板带正电,则自感电动势正在减小 D.若电容器正在充电,则自感电动势正在阻碍电流减小 11.如图所示为LC振荡电路中电容器上的带电荷量q随时间t的变化曲线,则下列判断正确 的是( ) A.在b和d时刻,电路中电流为零 B.在O→a时间内,电场能转化为磁场能 C.在a和c时刻,电路里的能量全部储存在电容器的电场中 D.在O→a和c→d时间内,电容器被充电 12.如图所示为一理想LC电路,已充电的平行板电容器两极板水平放置.电路中开关断开时, 极板间有一带电灰尘(图中未画出)恰好静止.若不计带电灰尘对电路的影响,重力加速度为 g,灰尘运动时间大于振荡电路周期.当电路中的开关闭合以后,则( ) A.灰尘将在两极板间做往复运动 B.灰尘运动过程中加速度方向可能会向上 C.电场能最大时灰尘的加速度一定为零 D.磁场能最大时灰尘的加速度一定为g 13.如图所示,电源电动势为3 V,单刀双掷开关S先置于a端使电路稳定.在t=0时刻开 关S置于b端,若经检测发现,t=0.02 s时刻,自感线圈两端的电势差第一次为1.5 V.如 果不计振荡过程的能量损失,下列说法正确的是( ) A.t=0.04 s时回路中的电流为零 B.t=0.08 s时电感线圈中的自感电动势达到最大值,为3 V C.0.07~0.08 s时间内,电容器极板间电场方向竖直向上且逐渐减小 D.0.04~0.05 s时间内,线圈中的磁场能逐渐增大
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  1. CONNECT:[ UseTime:0.000968s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001645s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.003412s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000776s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001351s ]
  6. SELECT * FROM `set` [ RunTime:0.000531s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001934s ]
  8. SELECT * FROM `wendang` WHERE `id` = 373694 LIMIT 1 [ RunTime:0.005543s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 373694 [ RunTime:0.001611s ]
  10. UPDATE `wendang` SET `lasttime` = 1773120171 WHERE `id` = 373694 [ RunTime:0.001567s ]
  11. SELECT * FROM `wendang` WHERE `id` < 373694 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002443s ]
  12. SELECT * FROM `wendang` WHERE `id` > 373694 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001264s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 373694 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004420s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 373694 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003065s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 373694 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.017498s ]
0.231305s