Student understanding of wave behavior at a boundary: The limiting case of reflection at fixed and free ends
Student understanding of wave behavior at a boundary: The limiting case of reflection at fixed and free ends
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学生对边界处波行为的理解：固定端和自由端反射的极限情况
DOI：
10.1119/1.3560430
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发表时间：
2011
影响因子：
0.9
通讯作者：
P. Heron
中科院分区：
文献类型：
--
作者：
Mila Kryjevskaia;M. R. Stetzer;P. Heron
我们调查了学生对水中和弹性介质中的脉冲和周期波的边界波行为的理解。参与者是基于微积分的物理学入门的科学和工程专业的学生。我们记录了几个概念和推理困难，并描述了我们教学材料的改进和评估。结果表明，学生对叠加和反思某些方面的学习有了显着改善，但一些产生错误预测的推理模式仍然存在。这些困难之一是在需要系统地应用叠加原理来预测介质中的点在一段时间内的运动的情况下倾向于采用简单的基于规则的方法。
We investigated student understanding of wave behavior at a boundary in the context of pulses and periodic waves in water and in elastic media. The participants were science and engineering majors in introductory calculus-based physics. We document several conceptual and reasoning difficulties and describe the refinement and assessment of our instructional materials. The results show significant improvements in student learning of some aspects of superposition and reflection, but some reasoning patterns that yield incorrect predictions persist. Among these difficulties is the tendency to employ simple rule-based approaches in cases in which a systematic application of the superposition principle is necessary to predict the motion of points in the medium over an interval of time.