The server is under maintenance between 08:00 to 12:00 (GMT+08:00), and please visit later.
We apologize for any inconvenience caused
Login  | Sign Up  |  Oriprobe Inc. Feed
China/Asia On Demand
Journal Articles
Laws/Policies/Regulations
Companies/Products
Bookmark and Share
500 yi nian de chi zi
Author(s): 
Pages: 24-25
Year: Issue:  7
Journal: Knowledge is Power

Abstract: 我们在地球表面见到的岩石和化石这些东西的年龄,常常是以“亿年”为单位的,那它们的“岁数”到底是怎么测量出来的昵?其实测量方法并不难,我们只需要用一把合适的“尺子”来测量就可以了.经科学家研究发现,自然界中的某些放射性同位素,它们自身变化的计时单位也是亿年,比如铷-87,它的半衰期约为500亿年.那么,能否就用这500乙年的半衰期来帮助我们测量有关地质年代的问题呢?
Related Articles
No related articles found