| 查看: 650 | 回复: 6 | |||
| 当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖 | |||
飞的猪铁杆木虫 (文坛精英)
猪家族——飞的猪
|
[交流]
【Pure water】The Source of Energy
|
||
|
A summary of the physical and chemical nature of life must begin, not on the Earth, but in the Sun; in fact, at the Sun's very center. It is here that is to be found the source of the energy that the Sun constantly pours out into space as light and heat. This energy is librated at the center of the Sun as billions upon billions of nuclei of hydrogen atoms collide with each other and fuse together to form nuclei of helium, and in doing so, release some of the energy that is stored in the nuclei of atoms. The output of light and heat of the Sun requires that some 600 million tons of hydrogen be converted into helium in the Sun every second. This the Sun has been doing for several thousands of millions of year. the nuclear energy is released at the Sun's center as high-energy gamma radiation, a form of electromagnetic radiation like light and radio waves, only of very much shorter wavelength. This gamma radiation is absorbed by atoms inside the Sun to be reemitted at slightly longer wavelengths. This radiation , in its turn is absorbed and reemitted. As the energy filters through the layers of the solar interior, it passes through the X-ray part of the spectrum eventually becoming light. At this stage, it has reached what we call the solar surface, and can escape into space without being absorbed further by solar atoms. A very small fraction of the Sun's light and heat is emitted in such directions that after passing unhindered through interplanetary space, it hits the Earth. From: http://www.hxen.com/englisharticle/duanwen/2007-12-03/19702.html |
回复此楼» 猜你喜欢
求调剂
已经有12人回复
-
通信工程求调剂！！！
已经有4人回复
-
材料工程085601，270求调剂
已经有46人回复
-
药学305求调剂
已经有5人回复
-
一志愿211，化学310分，本科重点双非，求调剂
已经有24人回复
-
272分材料子求调剂
已经有54人回复
-
085500求调剂材料
已经有11人回复
-
291分调剂
已经有7人回复
-
291 求调剂
已经有37人回复
-
一志愿中国科学院上海有机所，有机化学356分找调剂
已经有13人回复
飞的猪
铁杆木虫 (文坛精英)
猪家族——飞的猪
- ESEPI: 1
- 应助: 3 (幼儿园)
- 贵宾: 0.265
- 金币: 9534.7
- 散金: 1075
- 红花: 15
- 沙发: 911
- 帖子: 19560
- 在线: 842.3小时
- 虫号: 1020793
- 注册: 2010-05-17
- 专业: 生物物理化学
7楼2010-11-20 10:33:35
猪会飞
荣誉版主 (文坛精英)
猪猪家族之猪会飞
- 应助: 2 (幼儿园)
- 贵宾: 0.446
- 金币: 14512.2
- 散金: 3365
- 红花: 13
- 沙发: 384
- 帖子: 15097
- 在线: 4505.8小时
- 虫号: 1017687
- 注册: 2010-05-13
- 专业: 应用高分子化学与物理
- 管辖: 论文投稿
great2楼2010-11-20 09:33:16
xia_chong
金虫 (文坛精英)
- ESEPI: 43
- 应助: 0 (幼儿园)
- 贵宾: 1.591
- 金币: 10270.8
- 散金: 2377
- 红花: 34
- 沙发: 160
- 帖子: 12455
- 在线: 1941.8小时
- 虫号: 804303
- 注册: 2009-07-06
- 性别: GG
- 专业: 粒子物理学和场论
- 管辖: English Cafe
4楼2010-11-20 10:18:59
飞的猪
铁杆木虫 (文坛精英)
猪家族——飞的猪
- ESEPI: 1
- 应助: 3 (幼儿园)
- 贵宾: 0.265
- 金币: 9534.7
- 散金: 1075
- 红花: 15
- 沙发: 911
- 帖子: 19560
- 在线: 842.3小时
- 虫号: 1020793
- 注册: 2010-05-17
- 专业: 生物物理化学
5楼2010-11-20 10:25:39
20