7
lesson pretestMultiple Choice

Pretest

Question 7 • Physics

What is the net change that occurs during the fusion process in the Sun?

Answer
A
Four hydrogen nuclei join to form a helium nucleus, two neutrinos, and energy.
B
Two hydrogen nuclei come together to produce a helium nucleus and energy.
C
Two helium nuclei come together to form a larger helium nucleus, two protons, and energy.
D
Six hydrogen nuclei and two electrons join to form a helium nucleus, two protons, two neutrinos, and energy.

Explanation

In the Sun’s overall fusion process, four hydrogen nuclei ultimately combine to make one helium nucleus. The net reaction also releases two neutrinos and energy. Choice A gives this overall result; the other choices have the wrong number or type of nuclei in the net reaction.

AI-written and checked against the verified answer.

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