Alpha particles comprise 2 neutrons and 2 protons. Because of their large mass and relatively slow speed, alpha particles are the least penetrating of the three types of radiation, and can be stopped ...
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Alpha, Beta & Gamma Nuclear Decay - Energy Absorption vs Emission - Radioactivity & Radiation
Nuclear Radioactivity - alpha, beta, gamma decay, photoelectric effect, photosynthesis, Planck constant, absorption, emission, mass defect, strong nuclear force, repulsive force, fusion, fission, ...
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