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《奇幻科学城》上演炫酷激光秀 博士团勇闯激光阵

2017-09-22 14:17:19   中国网

中国网娱乐9月22日讯 激光为何被称为最快的刀、最亮的光和最准的尺?永远笔直的激光为何开始走“弯路”?它又如何操控磁性?本周五晚21:15辽宁卫视大型演播室亲子科普节目——《奇幻科学城》将带着观众走近神秘的激光。中科院物理所研究员许秀来将担任本期“神奇大教授”,携手博士团和孩子王大兵,带领好奇萌娃团一起揭秘高效与危险并存的不可一“视”的激光。

气球遇激光瞬间爆炸 博士团勇闯激光阵

炫酷的激光秀震撼开场,许秀来介绍到激光被誉为20世纪最伟大的发明,不仅改变着科技发展的轨道,也改变着人们的生活,同时说到激光由于其特有的特性而被称为最快的刀。那么“固定功率大小的蓝色激光能够最快打爆哪种颜色的气球?”萌娃们脑洞大开,都认为黑色吸光,热得快,所以最快打爆的应该是黑色气球。实验过程让现场惊叹连连,白色气球超过三十秒依然“毫发无伤”,蓝色气球在两秒钟左右爆炸,而黑色气球基本是在接触到激光瞬间爆炸。许秀来解释这是因为激光虽然强,可以打破很多非常硬的物质,但是激光能够发挥作用的前提是能够被想要打破的物质所吸收。白色气球会将蓝色激光反射出去,蓝色气球会反射一部分光,而黑色气球吸收了所有的蓝色激光,所以会迅速爆炸。

随后博士团现场用激光将多米诺齐黑色气球阵迅速“爆破”,让萌娃们更直观地感受到了激光的不可思议。紧接着博士团挑战低功率安全的激光阵,又会演绎出哪些精彩呢?

激光混合成白色 改变磁性趣味多

人们常见的太阳光是一种复合型的光,而激光可以做到单一光源,且只拥有一种颜色。博士团由此提出疑问“将红色激光、蓝色激光和绿色激光照射在同一处,光照区会变成什么颜色?”萌娃们猜测激光的单色性会使得三种光照射在一起仍然保持原本的颜色,所以当三种颜色的激光照在一起时会呈现彩色。通过实验证明三色激光汇聚在一起会变成白色,对于这样的结果,萌娃们都无比诧异。

探究了激光的快和颜色,许秀来又提出一个有趣的理论:加热激光能够改变物体的磁性。那么我们用激光笔照射漂浮在贴磁盘上的石墨时,磁铁会发生哪种变化?面对疑问,萌娃认为激光能够改变磁场,但是磁场依然存在,所以磁铁不会直接跌落,也不会往反方向走,而是会随着磁铁的方向走。博士团带领萌娃们做起实验,原来磁铁加热后,会朝着激光照射的方向前进。许秀来分析这是因为石墨具有抗磁性,当用激光笔照射其边缘,加热部分的抗磁性就会消失,有抗磁性的地方就会推着没有抗磁性的地方走,于是会出现磁铁朝着激光方向走的神奇现象。

不可思议的实验和现象将树立激光在人们心中的全新形象,激发人们对耳熟能详的激光重新产生探索兴趣。《奇幻科学城》作为一个在卫视播出的大型演播室亲子科普节目,一直坚持“探秘大不同”的理念,通过解剖生活中最常见却暗藏趣味科学的现象和事物,引发家长和孩子对生活中最表面的现象进行深度思考,培养人们的科学意识和思维,让科学走进千家万户。

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