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,,]
优秀!英语数学双满分,广西“最牛”高考状元730分刷新最高纪录
1000张学生用草稿纸考研专用免邮空白便宜薄演草演算纸白纸本书写纸批发打草a4大张实惠装18k高考数学草稿本
高考阅卷名师给考生的高考作文密训课 第3集 高考作文审题实操方法精讲(一)
创艺第二届:2019届高考录取表彰大会暨“核桃音乐节”合影——你只管努力,剩下的交给创艺
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
爆笑班主任 第一季 第220集 高考前最后一只视频,山东王老师揭秘高考的秘密
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