Physics · Class 12 · Chapter 13
Nuclei
11 lessons96 min5 simulations10 practice questions
What is a nucleus made of, how big is it, and why does it hold together when its protons repel one another? This chapter builds the nucleus from protons and neutrons, measures it with R = R₀A^(1/3), and uses E = mc² to turn the mass defect into binding energy. The binding-energy-per-nucleon curve then explains where nuclear energy comes from: heavy nuclei release it by splitting (fission) and light nuclei by joining (fusion), which powers reactors and the stars.
Also called: nuclear physics · radioactivity · binding energy · half-life
Lessons
11 lessons · 96 min
01Atomic mass unit and isotopesNCERT §13.1, §13.27 min02Protons, neutrons and nuclidesNCERT §13.27 min03Size of the nucleusNCERT §13.310 min1 sim04Mass–energy equivalenceNCERT §13.4.17 min05Mass defect and binding energyNCERT §13.4.210 min1 sim06Binding energy curveNCERT §13.4.210 min1 sim07Nuclear forceNCERT §13.56 min08RadioactivityNCERT §13.613 min2 sims09Nuclear fissionNCERT §13.7, §13.7.17 min10Nuclear fusion in starsNCERT §13.7.2, §13.7.37 min11Chapter reviewMust-know facts, traps and formulas12 min
Simulations
5 in this chapter