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Learn Nuclear Physics

Explore the atomic nucleus, radioactivity and the energy of fission and fusion.

Free to start. Built from a single prompt. No credit card.

Nuclear physics studies the atomic nucleus: what holds protons and neutrons together, why some nuclei are unstable, and how they release energy. Its story runs from Becquerel's discovery of radioactivity and Rutherford's gold foil experiment to nuclear power, medical imaging and the fusion that lights the stars. The core tools are surprisingly approachable: mass-energy equivalence, the binding energy curve and exponential decay. Learnr builds a nuclear physics course from your prompt and teaches it in bite-sized interactive lessons that respond to how well you are doing.

How to learn Nuclear Physics, step by step

Learn how the nucleus was found. Study the Geiger-Marsden gold foil experiment and why a few alpha particles bouncing back overturned the plum pudding model. Then learn nuclear notation with mass number and atomic number, and what makes two atoms isotopes.
Compute binding energy from mass defect. Add up the masses of a nucleus's protons and neutrons, subtract the measured nuclear mass, and convert the difference with E = mc^2. Plot binding energy per nucleon to see the curve peak near iron.
Balance decay equations. Write alpha, beta-minus, beta-plus and gamma decays, conserving mass number and charge in each. Practice reading a decay chain such as uranium-238 to lead-206 and identifying each step.
Master half-life and exponential decay. Use N = N0 times one half raised to t over the half-life, then the version with the decay constant and natural log. Apply it to carbon-14 dating, and check your answers by counting half-lives in your head.
Compare fission and fusion through the curve. Explain why splitting uranium-235 and fusing hydrogen both move toward the peak of the binding energy curve. Then study chain reactions, critical mass, moderators and control rods, and why fusion needs such extreme temperatures.
Learn radiation units and keep reviewing. Distinguish activity in becquerels from dose in grays and sieverts, and compare penetrating power of alpha, beta and gamma radiation. Short daily Learnr reviews keep the many units and decay types from blurring.

What you'll learn

Describe the structure of the nucleus, isotopes and nuclear notation
Calculate binding energy from mass defect using E = mc^2
Write balanced equations for alpha, beta and gamma decay
Solve half-life and activity problems using exponential decay
Explain why fission of heavy nuclei and fusion of light nuclei both release energy

What's inside your Nuclear Physics course

A sample path Learnr builds for Nuclear Physics. Your real course adapts to your goal and level.

1. Discovering the nucleus: Rutherford and isotopes
2. The strong force, mass defect and binding energy
3. Radioactive decay and nuclear equations
4. Half-life, activity and radiometric dating
5. Fission, chain reactions and reactors
6. Fusion, radiation and its biological effects

How long does it take to learn Nuclear Physics?

An introductory unit on the nucleus, decay and fission takes about 3 to 6 weeks at 3 to 4 hours a week. A full undergraduate nuclear physics course with the shell model and nuclear reactions takes a semester and assumes quantum mechanics, so total time depends on your physics background.

What you need before you start

Basic chemistry on atoms and isotopes, algebra, and exponents and logarithms for decay problems. Advanced study needs calculus and an introduction to quantum mechanics.

Common mistakes to avoid

Thinking a half-life means a sample is completely gone after two half-lives. After each half-life, half of what remains decays, so a quarter is left after two.
Assuming beta particles come from the electron cloud. Beta-minus decay happens when a neutron in the nucleus turns into a proton and emits an electron.
Treating every kind of radiation as equally dangerous. Penetration, energy and whether the source is inside or outside the body all change the effect.

How Learnr builds your course

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Nuclear Physics questions, answered

What is the difference between nuclear physics and particle physics?

Nuclear physics studies nuclei made of protons and neutrons and how they behave. Particle physics studies the more fundamental particles inside them, such as quarks, and the forces between all elementary particles.

Is learning nuclear physics dangerous?

No. Learning the theory involves no radiation exposure. Real lab work with radioactive sources happens only under trained supervision and strict safety rules.

Why does fusion power the Sun?

In the Sun's core, extreme temperature and pressure let hydrogen nuclei overcome their electric repulsion and fuse into helium. The products are slightly lighter than the inputs, and that missing mass is released as energy.