Radioactive Decay
Stochastic decay of atoms vs theoretical N(t) = N₀e^(−λt) with λ = ln2/T½.
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Class 12 · Notes
Nuclei— Notes, Formulas & Revision
Complete revision notes and formulas for Nuclei (Class 12). Curated for JEE, NEET, AP Physics, SAT, and CUET. Tap any topic to open the live simulation and full PYQ set.
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Decay Curve
Side-by-side linear N(t) + semilog lnN(t) — slope = −λ on the log plot.
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Binding Energy per Nucleon
Weizsäcker semi-empirical mass formula — peak at ⁵⁶Fe, labeled key nuclei.
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Nuclear Reactions (Q-value)
Q = Δm · c² — preset D-T, D-D, p-Li fusion and U-235 fission reactions.
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Nuclear Fission
Animated chain reaction — tune k to toggle subcritical / critical / supercritical.
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Nuclear Fusion
D-T fusion overcoming Coulomb barrier — plasma T sets kinetic energy.
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Mass–Energy Equivalence
E = mc² — mass in amu → J, MeV, kWh, megatons TNT. Presets for electron → ²³⁵U.
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Nuclei on sciphylab (also known as SciPhy, SciPhy Lab, SciPhy Labs). Free physics revision for Class 12, JEE Mains, JEE Advanced, NEET UG, AP Physics 1/2/C, SAT Subject Physics, and CUET-UG.