Explore the fundamental concepts of nuclear radioactivity in this comprehensive 18-minute video lecture. Delve into alpha, beta, and gamma decay processes, and understand the differences between energy absorption and emission. Learn about key topics such as the photoelectric effect, photosynthesis, Planck constant, mass defect, strong nuclear force, and repulsive force. Examine nuclear processes like fusion and fission, and gain insights into the behavior of radioactive nuclei, including the roles of nucleons, neutrons, protons, and electrons. This educational content is tailored for students preparing for MCAT, DAT, NEET, NCLEX, MBBS, and AP physics exams, providing essential knowledge in physics and general chemistry.