What term describes a material whose atomic nucleus spontaneously decays or disintegrates, releasing radiation?

What term describes a material whose atomic nucleus spontaneously decays or disintegrates, releasing radiation?

• A. Radioactive Material
• B. Non-Ionizing Radiation
• C. Gamma Radiation
• D. Alpha Radiation

Answer: (A)

The main idea here is radioactivity: a material whose atomic nucleus is unstable and undergoes spontaneous decay, releasing radiation. Such a material is called a radioactive material because the property that defines it is the nucleus’s tendency to transform and emit energy in the process. The emitted radiation can take the form of alpha, beta, or gamma radiation, but those are descriptions of the radiation itself, not the material. Non-ionizing radiation refers to radiation that does not ionize matter, which isn’t about the stability of the nucleus. Gamma and alpha radiation are specific types of radiation that may be released by radioactive materials, not the term for the material itself.

The main idea here is radioactivity: a material whose atomic nucleus is unstable and undergoes spontaneous decay, releasing radiation. Such a material is called a radioactive material because the property that defines it is the nucleus’s tendency to transform and emit energy in the process. The emitted radiation can take the form of alpha, beta, or gamma radiation, but those are descriptions of the radiation itself, not the material. Non-ionizing radiation refers to radiation that does not ionize matter, which isn’t about the stability of the nucleus. Gamma and alpha radiation are specific types of radiation that may be released by radioactive materials, not the term for the material itself.