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2026年山东真题 14 题试题分析

2026年山东真题 14 题试题分析

第14题(8分)——双缝干涉实验测光的波长

① 原题+标准解析

原题

图1:光具座示意图

图2:干涉条纹图

用光传感器做双缝干涉实验并测量光的波长 

(1) 避免激光直接射入眼睛,因为激光具有___的特点。

(2) 双缝到光传感器的距离 ___

(3) A区域宽度 ,条纹间距 ___

(4) 公式 ___,波长 ,属于___。

标准解析

(1) 亮度高

激光具有亮度高、方向性好、相干性好、单色性好等特点。避免直接射入眼睛是因为激光亮度高,能量集中,直接射入眼睛会灼伤视网膜。注意:相干性好是双缝干涉实验原理的需要,但伤害眼睛的原因是亮度高。

(2) 31.25

光具座读数:双缝位置 ,光传感器位置 

(3) 0.40

A区域有 6 个条纹间距(7 条亮纹之间有 6 个间距),

(4) ,可见光

由双缝干涉条纹间距公式 变形得:

在可见光范围 内,属于可见光。

② 命题立意

  1. 考查主干知识点:双缝干涉实验原理、条纹间距公式 、光具座读数方法、激光的特点、电磁波谱分类。

  2. 山东卷偏好:山东卷光学实验题常考双缝干涉和折射率测量,本题将传统目视观察升级为光传感器测量,体现新课标对数字化实验的要求。读数题和条纹间距计算是山东卷的固定套路。

  3. 教材溯源:人教版选择性必修一《光的干涉》一节,实验"用双缝干涉测量光的波长"。

③ 考生高频错因|考场大坑

  1. (1) 选"相干性好"而非"亮度高":这是最典型的概念混淆!相干性好是双缝干涉实验能成功的原因,但题目问的是"为什么避免激光射入眼睛",答案是亮度高。审题要分清"实验原理需要"和"安全注意事项"。

  2. (2) 读数错误:常见错误包括只读一个位置(忘记做差)、有效数字位数不对、读数时没有估读到最小刻度的下一位。

  3. (3) 数错条纹间距数条亮纹之间有 个间距。A区域有 7 条亮纹,所以是 个间距,有的同学误算为 7 个间距,得到 

  4. (4) 公式变形错误:将 变形时,分子分母搞反,写成 或 

④ 一题拓展|备考延伸

一题多变:若用白光代替激光,条纹会怎样变化?

白光包含各种波长的光,不同波长的光条纹间距不同:

  • 中央亮纹为白色(各波长零级条纹重合)
  • 两侧条纹出现彩色,紫光(小)靠近中央,红光(大)远离中央
  • 高级次条纹会重叠,无法分辨

这就是为什么双缝干涉测波长实验要用单色光(激光)。

一题多解:条纹间距的测量方法——

  • 方法一:直接测量一个条纹间距(误差大)
  • 方法二:测量多个条纹间距再求平均(本题方法,误差小)
  • 方法三:用逐差法处理数据

⑤ 复习指引|给山东考生的建议

  1. 光具座读数注意有效数字:刻度尺读数要估读到最小刻度的下一位,本题中 和 都是四位有效数字。

  2. 条纹间距数法要准确:牢记"亮纹数减一等于间距数"。

  3. 激光四大特点要区分:亮度高(伤眼)、方向性好(准直)、相干性好(干涉实验)、单色性好(谱线窄)。考试常考"为什么用激光"和"为什么避免激光射眼"两个不同角度。

  4. 山东卷光学实验备考重点:双缝干涉测波长、折射率测量、光具座读数、条纹间距计算。建议专项训练近5年相关真题。

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  1. CONNECT:[ UseTime:0.000882s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001542s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000776s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000622s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001321s ]
  6. SELECT * FROM `set` [ RunTime:0.000572s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001553s ]
  8. SELECT * FROM `article` WHERE `id` = 928615 LIMIT 1 [ RunTime:0.001037s ]
  9. UPDATE `article` SET `lasttime` = 1786620455 WHERE `id` = 928615 [ RunTime:0.002112s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000691s ]
  11. SELECT * FROM `article` WHERE `id` < 928615 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001091s ]
  12. SELECT * FROM `article` WHERE `id` > 928615 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000944s ]
  13. SELECT * FROM `article` WHERE `id` < 928615 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002170s ]
  14. SELECT * FROM `article` WHERE `id` < 928615 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002334s ]
  15. SELECT * FROM `article` WHERE `id` < 928615 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002895s ]
0.161143s