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Einstein's equation hf = φ + KE_max and stopping potential.
Every particle has a wavelength λ = h/p.
Quantized orbits and energy levels of hydrogen.
Lyman, Balmer, Paschen series via the Rydberg formula.
Protons, neutrons, mass number A, atomic number Z, isotopes.
Alpha, beta, and gamma emission with conservation rules.
Exponential decay; T₁/₂ = ln2/λ; activity A = λN.
Δm·c² and the binding-energy-per-nucleon curve.
Heavy-nucleus splitting; chain reaction and energy release.
Light-nucleus combination; stellar energy source.