Question

question 2 of 30 how does nuclear fission usually start? a. an alpha particle enters the nucleus of an already unstable atom. b. a neutron enters the nucleus of an already unstable atom. c. an electron enters the nucleus of an already unstable atom. d. a proton enters the nucleus of an already unstable atom.

Explanation:

Nuclear fission is initiated by the absorption of a neutron by an unstable heavy nucleus, causing it to split. Electrons are in the electron cloud, alpha particles are helium nuclei, and protons (positive) are repelled by the positive nucleus, making neutrons the typical initiator.

Answer:

B. A neutron enters the nucleus of an already unstable atom.