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Evolution of Stars

How many heli...

Question

How many helium nuclei fuse together when making carbon?

A

2

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B

3

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C

4

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D

None of the above

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Solution

The correct option is C 3
At sufficiently high temperatures and densities, a 3-body reaction called the triple alpha process can occur: Two helium nuclei ("alpha particles") fuse to form unstable beryllium.
If another helium nucleus can fuse with the beryllium nucleus before it decays, stable carbon is formed along with a gamma ray.

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