130s Classroom → 30s Sub-90 Target27-Q Physics Mock
Archetype Sub-90 Dry-Wipe Invariant (Nuclear Decay Chains (α, β⁻, γ), Isotope Algebra & Background-Corrected Half-Life Calculus): Decay chain 2-step rule: (1) Mass number A only changes via alpha: N_alpha = (A_start - A_end)/4. (2) Proton number: N_beta = Z_end - (Z_start - 2*N_alpha). For count rates: Net = Raw - Background.
sub90 ESATARCH-P-12: Nuclear Decay Chains (α, β⁻, γ), Isotope Algebra & Background-Corrected Half-Life CalculusPhysics
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SUB-90 ZONE (<30S)
0.0s30s Sub-9090s ESAT Budget150s Classroom
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