本题目来源于试卷: Astrophysics and Cosmology，类别为 IB物理学
[问答题]
Why were atoms, as opposed to bv 5e(* boj3hipare nuclei, unable to exist j:n;a83i m qwn l ;r-)chs8vjiuntil hundreds of thousands of years w ;mqin:n3vh l )8j8s-cr aij;after the Big Bang?
参考答案:
Atoms were unable to exist until hundreds of thousands of years after the Big Bang because the temperature of the universe was still too high until that time. At those incredibly high temperatures, the free electrons and nuclei were moving so fast and had so much kinetic energy, and they had so many high energy photons colliding with them, that they could never combine together to form atoms. Once the universe cooled below 3000 K, this coupling could take place, and atoms were formed.
本题详细解析:
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