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第14章实验14 用双缝干涉测量光的波长_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_大一轮复习讲义

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第14章实验14 用双缝干涉测量光的波长_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_大一轮复习讲义
第14章实验14 用双缝干涉测量光的波长_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_大一轮复习讲义
第14章实验14 用双缝干涉测量光的波长_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_大一轮复习讲义

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实验十四 用双缝干涉测量光的波长 目标要求 1.掌握由Δx=λ测量光的波长的原理,并会测单色光波长.2.观察单色光的双缝 干涉图样,掌握测量头测量条纹间距的方法. 实验技能储备 1.实验原理 单色光通过单缝后,经双缝产生稳定的干涉图样,图样中相邻两条亮(暗)条纹间距Δx与双 缝间距d、双缝到屏的距离l、单色光波长λ之间满足λ=________________. 2.实验步骤 (1)观察双缝干涉图样 ①将光源、遮光筒、毛玻璃依次安放在光具座上,如图所示. ②接好光源,打开开关,使灯丝正常发光. ③调节各器件的高度和角度,使光源灯丝发出的光能沿遮光筒轴线到达光屏. ④安装单缝和双缝,尽量使缝的中点位于遮光筒的轴线上,使单缝与双缝________,二者间 距约为5~10 cm. ⑤在单缝和光源间放上滤光片,观察单色光的干涉条纹. (2)测量单色光的波长 ①安装测量头,调节至可清晰观察到干涉条纹. ②使分划板中心刻线对齐某条亮条纹的中心,记下此时手轮上的读数 a ,将该条纹记为第1 1 条亮条纹;转动手轮,使分划板中心刻线移动至第n条亮条纹的中心,记下此时手轮上的读 数a. n ③用刻度尺测量双缝与光屏间距离l(d是已知的). ④改变双缝间的距离d,双缝到屏的距离l,重复测量. 3.数据分析 (1)条纹间距Δx=________________. (2)波长λ=Δx. (3)计算多组数据,求λ的平均值. 4.注意事项(1)安装时,注意使光源、透镜、滤光片、单缝、双缝的中心均在遮光筒的中心轴线上,并 使单缝、双缝平行且间距适当. (2)光源灯丝最好为线状灯丝,并与单缝平行且靠近. (3)调节的基本依据:照在光屏上的光很弱,主要原因是灯丝与单缝、双缝,测量头与遮光 筒不共轴;干涉条纹不清晰,一般原因是单缝与双缝不平行. 考点一 教材原型实验 例1 如图所示,在“用双缝干涉测量光的波长”实验中: (1)在光具座上放置的光学元件依次为:①光源、②滤光片、③________、④________、⑤ 遮光筒、⑥光屏(含测量头). (2)利用图中装置研究双缝干涉现象时,下列说法中正确的是________. A.将光屏移近双缝,其他条件不变,干涉条纹间距变小 B.将滤光片由蓝色的换成红色的,其他条件不变,干涉条纹间距变大 C.将单缝向双缝移动一小段距离后,其他条件不变,干涉条纹间距变大 D.换一个两缝之间距离更大的双缝,其他条件不变,干涉条纹间距变小 E.去掉滤光片,其他条件不变,干涉现象消失 (3)在某次测量中,将测量头的分划板中心刻线与某条亮条纹中心对齐,将该亮条纹记为第 1 条亮条纹,此时手轮上的示数如图甲所示.然后同方向转动测量头,使分划板中心刻线与第 6条亮条纹中心对齐,此时手轮上的示数如图乙所示,则此示数为________ mm,由此可求 得相邻亮条纹的间距Δx为________ mm. (4)已知双缝间距 d 为 2.0×10-4 m,测得双缝到屏的距离 l 为 0.700 m,由计算式 λ= __________,求得所测红光波长为________ nm. 例2 (2023·浙江省镇海中学模拟)(1)如图所示,小王同学做在“用双缝干涉测量光的波 长”实验中发现目镜中干涉条纹与分划板中心刻线始终有一定的角度,下列哪个操作可以使 得分划板中心刻线与干涉条纹平行________.A.仅拨动拨杆 B.仅旋转单缝 C.仅前后移动凸透镜 D.仅旋转毛玻璃处的测量头 (2)小王同学将分划板中心刻线与干涉条纹调平行后,将测量头的分划板中心刻线与某条亮 条纹中心对齐,将该亮条纹定为第1条亮条纹,此时手轮上的示数如图所示,手轮上的示数 是________ mm. 考点二 探索创新实验 例3 洛埃德在1834年提出了一种更简单的观察干涉的装置.如图所示,单色光从单缝S 射出,一部分入射到平面镜后反射到屏上,另一部分直接投射到屏上,在屏上两光束交叠区 域里将出现干涉条纹.单缝S通过平面镜成的像是S′. (1)通过洛埃德镜在屏上可以观察到明暗相间的干涉条纹,这和双缝干涉实验得到的干涉条 纹一致.如果S被视为其中的一个缝,____________相当于另一个“缝”. (2)实验中已知单缝S到平面镜的垂直距离h=0.15 mm,单缝到光屏的距离D=1.2 m,观测 到第3条亮条纹中心到第 12条亮条纹中心的间距为 22.78 mm,则该单色光的波长 λ= ________ m.(结果保留1位有效数字) (3)以下哪些操作能够增大光屏上相邻两条亮条纹之间的距离________. A.将平面镜稍向上移动一些 B.将平面镜稍向右移动一些 C.将光屏稍向右移动一些 D.将光源由红色光改为绿色光
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  1. CONNECT:[ UseTime:0.001102s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001717s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000758s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000663s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001298s ]
  6. SELECT * FROM `set` [ RunTime:0.000577s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001529s ]
  8. SELECT * FROM `wendang` WHERE `id` = 373735 LIMIT 1 [ RunTime:0.001377s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 373735 [ RunTime:0.041748s ]
  10. UPDATE `wendang` SET `lasttime` = 1773120701 WHERE `id` = 373735 [ RunTime:0.000576s ]
  11. SELECT * FROM `wendang` WHERE `id` < 373735 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000461s ]
  12. SELECT * FROM `wendang` WHERE `id` > 373735 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000377s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 373735 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003628s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 373735 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002140s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 373735 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002062s ]
0.210312s