Nuclear fission occurs when
a. tnt and plutonium are combined, causing the molecules to separate.
b. a nucleus breaks up into two equal fragments that release and separate more atoms.
c. like atoms collide to create double nuclei.
d. trinitite is created by multiple molecules that form a single atom.

  B- A nucleus breaks up into two equal fragments that release and separate more atoms.

Explanation:

  Nuclear Fission is a nuclear reaction process in which a nucleus of an atom splits and often produces free Neutron and gamma photons and a big amount of energy.

  It is a form of nuclear transmutation because the resulting fragments are not the same elements as the original Atom. The two nuclei produced are sometimes of comparable sizes.

  I hope this answer helps you.

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