Which of the following is the best definition of radioactive decay? a. radioactive decay is the release of energy resulting from a chemical reaction. b. radioactive decay is the loss of mass that occurs when an atom is formed. c. radioactive decay is the splitting of a nucleus to produce huge amounts of energy. d. radioactive decay is the spontaneous breakdown of a nucleus into smaller parts.

Answer : The correct option is, (D) Radioactive decay is the spontaneous breakdown of a nucleus into smaller parts.

Explanation :

Radioactive decay : It is a process in which a less stable nuclei spontaneously breakdown or decomposes into a stable nuclei. During this process some amount of radiations or particles like alpha, beta particles or gamma-radiations are released.

Hence, the correct option is, (D) Radioactive decay is the spontaneous breakdown of a nucleus into smaller parts.

d.) circle motion requires a force to give it a centripetal acceleration.

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