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介绍了第35届全国中学生物理竞赛决赛实验试题的实验内容,并给出了试题解析以及竞赛成绩分析.试题1为测量光学玻璃材料的杨氏模量和折射率,可分为3部分:利用洛埃法测量半导体激光器的波长,利用单缝衍射法测定光学玻璃条的杨氏模量,测量厚光学玻璃片的折射率.试题2为测量电学黑盒子,给出其中元件连接的结构和元件性质,利用黑盒子的电路和电容率测量仪等,测量真空电容率和给定介质的相对电容率.实验试题设计性较强,成绩区分度较好.建议学生平时注重基本实验仪器的使用训练,掌握实验技巧,并加强物理基本原理的灵活应用. 相似文献
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The photoinduced birefringence in an azobenzene polymer is investigated at different temperatures between -20℃ to 50℃. It is found that there is a peak value of photoinduced birefringence in the temperature dependence of the photoinduced birefringence under a certain pumping intensity. With the pump light in 90mW/cm^2, the peak value of the photoinduced birefringence appeared at about 0℃ C. The effect of temperature on the photoinduced birefringence is discussed using the competition mechanism between the photoinduced reorientation and the thermal random motion. 相似文献
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