What happens because of the formation of atoms?

A.) Nucleosynthesis.
B.) Formation of protons.
C.) Formation of quarks.
D.) The cosmic microwave background is produced.
E.) The Universe starts to contract.


Ans: D.) The cosmic microwave background is produced.

Physics & Space Science

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The mass of an electron and its antiparticle, a positron, is 0.511 MeV/c2 . In order to produce an electron-positron pair, a gamma ray must have an energy larger than 1.022 MeV because __________

Fill in the blank(s) with correct word

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