明明是个十分伶俐的孩子,大自然中的一切现象在他看来都是有趣的。一天,他问爷爷:“天上的云为什么有白的,有黑的?” 爷爷说:“明明,在回答你这个问题之前,我先给你讲一个过去我给学生做过的实验吧。在那次实验课上,我拿一块银子给同学们看,问他们这块银子是什么颜色的,他们都回答是白色的,但当我拿出银粉给他们看时,他们却都说是黑色的。”讲到这里,明明莫名奇妙地问:“爷爷,银粉也是银,为什么颜色不一样呢?”爷爷说:“整块的银子表面很光滑,而太阳光是白色的, Obviously a very clever child, all the phenomena in nature are interesting to him. One day, he asked my grandfather: ”Why is the sky white, black?“ ”Grandpa said: “ Clearly, before answering your question, let me tell you an experiment I used to give students In that experiment, I took a piece of silver to my classmates and asked them what color the piece of silver was, and they all answered it was white, but when I took out the silver powder to show them, they all said Is black. ”Here, obviously inexplicably asked: “ Grandpa, silver is silver, why the color is not the same? ”“ Grandpa said: ”The whole piece of silver surface is very smooth, and the sun is white of,