Nuclei
A smoke detector, a hospital scanner and the Sun all work because of what happens inside the nucleus. The nucleus is a hundred thousand times narrower than the atom, yet it holds almost all of its mass and a million times more energy per particle than a chemical bond. This chapter follows the size and binding energy of the nucleus, radioactive decay, and fission and fusion. It covers the Nuclei unit of the Indian syllabus (NCERT, NEET, JEE Main) and the matching topics of A-Level, IB and AP Physics.
Part of Physics · High School (11–12) (chapter 26)
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The Nucleus: Size, Mass and Binding Energy
How big is a nucleus, and why does it weigh less than its parts? Mass number and isotopes, the size and density of nuclear matter, mass defect and binding energy with E = mc², and the binding energy curve that explains both fission and fusion.
Radioactive Decay and Half-Life
Why do some nuclei break up on their own? Alpha, beta and gamma decay with their nuclear equations, the decay law with half-life and mean life, and activity, decay series and radioactive dating.