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Quantized energy E = hf to resolve the UV catastrophe.
Einstein's equation hf = φ + KE_max and stopping potential.
Wavelength shift confirming photon momentum.
Every particle has a wavelength λ = h/p.
Quantized orbits and energy levels of hydrogen.
Lyman, Balmer, Paschen series via the Rydberg formula.
Δm·c² and the binding-energy-per-nucleon curve.
Alpha, beta, and gamma emission with conservation rules.
Heavy-nucleus splitting; chain reaction and energy release.
Light-nucleus combination; stellar energy source.