GK
BIG BANG THEORY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which is an input of step 4 of the proton-proton chain reaction?
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Hydrogen 1 atom
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Hydrogen 2 atom
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Helium 3 atom
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Helium 4 atom
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Explanation:
Detailed explanation-1: -In this reaction, helium-3 captures a proton directly to give helium-4, with an even higher possible neutrino energy (up to 18.8 MeV).
Detailed explanation-2: -First, two hydrogen nuclei (1H) combine to form a hydrogen-2 nucleus (2H, deuterium) with the emission of a positive electron (e+, positron) and a neutrino (). The hydrogen-2 nucleus then rapidly captures another proton to form a helium-3 nucleus (3He), while emitting a gamma ray ().
Detailed explanation-3: -In summary, the proton-proton chain requires a total input of four protons and produces an output of one helium-4 nucleus, 2 gamma rays, 2 positrons, and 2 neutrinos.
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