Question

origins of the universe quick check
which describes nuclear fission? (1 point)
○ starts when a neutron slams into an atom, causing the larger atom to split into two smaller atoms
○ starts when two atoms slam together, causing the larger atom to split into two smaller atoms
○ starts when two atoms slam together to form one, heavier atom
○ starts when a neutron slams into an atom, causing two atoms to form one, heavier atom

Explanation:

Nuclear fission is the process where a neutron collides with a heavy atom (like uranium), causing the heavy atom to split into two smaller atoms, releasing energy and more neutrons. The first option matches this: a neutron slams into an atom, causing the larger atom to split into two smaller atoms. The other options describe nuclear fusion (atoms combining to form a heavier atom) or incorrect fission mechanisms.

Answer:

A. starts when a neutron slams into an atom, causing the larger atom to split into two smaller atoms (assuming the first option is labeled A, adjust label as per original question's option numbering; if the first option is the correct one based on the description, this is the answer)