来自：查字典高考网 2014-12-25
霓虹灯
A neon light is the sort of light you see used in advertising signs. These signs are made of long, narrow glass tubes, and these tubes are often bent into all sorts of shapes. The tube of a neon light can spell out a word, for example. These tubes emit light in different colors.
The idea behind a neon light is simple. Inside the glass tube there is a gas like neon, argon or krypton at low pressure. At both ends of the tube there are metal electrodes. When you apply a high voltage to the electrodes, the neon gas ionizes, and electrons flow through the gas. These electrons excite the neon atoms and cause them to emit light that we can see. Neon emits red light when energized in this way. Other gases emit other colors.
【托福(toefl)阅读考试知识(二十六)】相关文章：
[标签：海外留学,语言考试,托福,,]
你高考成绩高吗？这道题目怎能成立？高难度奥数，能不能把你难住
张雪峰高考志愿填报指南 第47集 高考志愿，令人头疼的数学系，才是专业万金油，毕业后机会多
北京新闻 2019 5.9万余北京考生今日高考 语文试题鼓励创造性阅读与表达
美术联考用纸上海考试模拟试卷纸高考统考纸 4k水粉纸素描纸 速写纸卡纸美术模拟测试试卷纸 美术考试专用纸
高考前必听的5首励志歌曲，《Dream it possible》最能鼓舞人心！
爆笑班主任 第一季 第221集 高考结束学生有多疯狂？山东王老师疯狂吐槽
张雪峰高考志愿填报指南 第28集 高考志愿分析，材料科学与工程专业，就业很一般，建议慎重选择
amc传媒音乐影像 第一季 第598集 西安原创乐队走进英泰青卓 用音乐助力高考学子
