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白色塑料板与黑色塑料板谁的反射本领强?见了这个题目的自然老师,如果你轻易地下结论:白色塑料板反射本领强,那么,你可能会在学生自行探索的实验中遇到麻烦。 事情的经过是这样的,我按照刘默耕先生倡导的让学生在探索中获知这一教学策略的指引,本学期在上《光的直射与反射》这一课时(浙江版,第5册15课),为了让学生在实验探索中获得知识,我用配套的实验盒内的一块白色塑料板和一块黑色塑料板来做这个实验。心想这么对比强烈的材料效果一定很明显吧。我就让学生分组实验,把阳光反射到墙壁上,在巡视指导的过程中却发现学生互相说:“黑色塑料板比白色塑料板反射本领强。”我的第一感觉是学生实验方法错了,我走过去帮助他们纠正,没想到学生发现的是千真万确的事
If you can easily conclude that white plastic plates have a strong ability to reflect, then you may encounter troubles in experiments that students explore on their own. The course of things is like this. According to the guideline for students to learn about this teaching strategy advocated by Mr. Liu Mogeng, this semester is on the course of “Direct and Reflective Light” (Zhejiang edition, Volume 5, Volume 15) In order to let the students gain knowledge in the experiment, I used a white plastic plate and a black plastic plate in the experimental box to do this experiment. I think so strong contrast material effect is very obvious it. I let students group experiments, the sun reflected on the wall, in the process of inspection guide but found that students say each other: “black plastic plate stronger than the white plastic plate reflection ability.” My first feeling is that students experimental method is wrong , I walked to help them correct, did not expect the students found is true