Which statement correctly describes radioactivity and nuclear energy?

Which statement correctly describes radioactivity and nuclear energy?

• A. Radioactivity and nuclear energy are the same concept.
• B. Nuclear energy is obtained only from chemical reactions.
• C. Radioactivity involves emitting radiation; nuclear energy is energy from fission or fusion.
• D. Radioactivity is harmful and nuclear energy always safe.

Answer: (C)

Radioactivity is the spontaneous emission of radiation from unstable atomic nuclei, while nuclear energy comes from changes in the nucleus through fission or fusion, releasing much larger amounts of energy than chemical processes. This distinction matters because it shows one concept is about the process of nuclei decaying and emitting radiation, and the other is about the energy produced by nuclear reactions. The statement matches this difference by saying radioactivity involves emitting radiation and nuclear energy arises from fission or fusion, which is the correct relationship. The other ideas mix up these ideas or oversimplify safety—radioactivity can be harmful, and nuclear energy is not always unsafe when properly managed, and chemical reactions do not provide the same kind of nuclear energy.

Radioactivity is the spontaneous emission of radiation from unstable atomic nuclei, while nuclear energy comes from changes in the nucleus through fission or fusion, releasing much larger amounts of energy than chemical processes. This distinction matters because it shows one concept is about the process of nuclei decaying and emitting radiation, and the other is about the energy produced by nuclear reactions. The statement matches this difference by saying radioactivity involves emitting radiation and nuclear energy arises from fission or fusion, which is the correct relationship. The other ideas mix up these ideas or oversimplify safety—radioactivity can be harmful, and nuclear energy is not always unsafe when properly managed, and chemical reactions do not provide the same kind of nuclear energy.