When did large amounts of completely ionized helium nuclei begin to accumulate i

Question

When did large amounts of completely ionized helium nuclei begin to accumulate in the universe? A microsecond after the big bang A second after the big bang Ten seconds after the big bang One hour after the big bang A thousand years after the big bang A few hundred thousand years after the big bang Three minutes after the big bang A half a billion years after the big bang More than a billion years after the big bang Which of the following best describes when the Earth was created? A microsecond after the big bang A second after the big bang Ten seconds after the big bang Three minutes after the big bang One hour after the big bang A thousand years after the big bang A few hundred thousand years after the big bang A half a billion years after the big bang More than a billion years after the big bang

Explanation / Answer

question 9.

the answer is 7 . 3 minutes after the bing bang because 3 minutes after the big bang finally the temperature drops sufficiently low (about 1 billion K) that deuterium nuclei can hold together. The deuterium bottleneck is thus broken and a rapid sequence of nuclear reactions combines neutrons and protons to form deuterium, and the resulting deuterium with neutrons and protons to form the ionized helium particles (alpha particles)

question 10.

the answer is 9.   More than a billon year after the big bang. Our Solar Sistem was formed about 4.5 billion year and the universe that started with the big bang has an estimated age of 13.799 ± 0.021 billion years.

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