Which radiation particle has no mass?

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Prepare for the JBL Hazardous Materials Test with focused study materials and multiple-choice quizzes. Understand key concepts and get ready for success with hints and explanations provided for each question!

Multiple Choice

Which radiation particle has no mass?

Explanation:
Think about what mass means for radiation. Gamma rays are photons, which are quanta of light—no rest mass at all. They carry energy and momentum, but they aren’t made of matter, so they don’t have mass. In contrast, alpha particles are helium nuclei with substantial mass, beta particles are electrons (with a tiny but finite rest mass), and neutrons are massive subatomic particles. So the radiation type with no mass is gamma rays.

Think about what mass means for radiation. Gamma rays are photons, which are quanta of light—no rest mass at all. They carry energy and momentum, but they aren’t made of matter, so they don’t have mass. In contrast, alpha particles are helium nuclei with substantial mass, beta particles are electrons (with a tiny but finite rest mass), and neutrons are massive subatomic particles. So the radiation type with no mass is gamma rays.

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