Which material spontaneously decays and releases radiation?

Which material spontaneously decays and releases radiation?

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

Answer: (C)

Radioactive material is the one that spontaneously decays. Radioactive decay is the process by which unstable atomic nuclei transform into more stable configurations, and in doing so they emit ionizing radiation. This means the material itself contains unstable nuclei that break down over time, releasing particles or waves such as alpha particles, beta particles, or gamma rays. The other terms describe the radiation types or energy form, not a material. Non‑ionizing radiation lacks enough energy to ionize atoms and isn’t about a substance that decays. Gamma radiation and alpha radiation are forms of radiation emitted during decay, not materials that undergo decay themselves.

Radioactive material is the one that spontaneously decays. Radioactive decay is the process by which unstable atomic nuclei transform into more stable configurations, and in doing so they emit ionizing radiation. This means the material itself contains unstable nuclei that break down over time, releasing particles or waves such as alpha particles, beta particles, or gamma rays.

The other terms describe the radiation types or energy form, not a material. Non‑ionizing radiation lacks enough energy to ionize atoms and isn’t about a substance that decays. Gamma radiation and alpha radiation are forms of radiation emitted during decay, not materials that undergo decay themselves.