当前位置: > Which of the following is not a reason for depletion of free hydrogen in Earth`s lower atmosphere...
题目
Which of the following is not a reason for depletion of free hydrogen in Earth`s lower atmosphere
A.Hydrogen being the lightestelement buoys to the upper most layer of earth`s atmosphere and leaks out.
B.All hydrogen atoms will havespeeds greater than the escape velocity of earth and so they escape earth`sgravitational pull.
C.Even those hydrogen atoms withspeeds less than the Escape velocity eventually acquire enough Kinetic Energyto escape the Earth`s pull,due to energy exchange during collisions events.
D.Some hydrogen atoms have speedsgreater than Earth`s escape velocity and so they escape Earth`s gravitationalpull

提问时间:2021-03-29

答案
选 B
不是所有的氢原子都具有如此大的速度
举一反三
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
奥巴马演讲不用看稿子.为什么中国领导演讲要看?
想找英语初三上学期的首字母填空练习……
英语翻译
1,人们染上烟瘾,最终因吸烟使自己丧命.
版权所有 CopyRight © 2012-2019 超级试练试题库 All Rights Reserved.