Energy emitted in the form of waves or particles is defined as which term?

• A. Ionizing radiation
• B. Beta particle
• C. Radiation
• D. X-ray

Answer: (C)

Energy emitted in the form of waves or particles is called radiation. This broad term covers both electromagnetic waves (like light, radio waves, X-rays) and energetic particles (such as alpha or beta particles, neutrons) that carry energy away from a source. Ionizing radiation is a subset of radiation with enough energy to remove electrons from atoms, which is why it’s emphasized in health physics, but the general concept for energy traveling as waves or particles is simply radiation. A beta particle or an X-ray are specific forms of radiation, but they don’t name the entire category as accurately as the broad term does.