Nucle
Jammu & Kashmir Board · Class 12 · Physics
All formulas from Nucle in Jammu & Kashmir Board Class 12 Physics. Key equations, constants, and identities for board exam preparation.
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Atomic Masses and Nuclear Composition
1u = mass of one 12C atom / 12 = 1.992647 × 10^-26 kg / 12 = 1.660539 × 10^-27 kg
A = Z + N
m_p = 1.00727 u = 1.67262 × 10^-27 kg
m_n = 1.00866 u = 1.6749 × 10^-27 kg
Nuclear Size and Nuclear Density
R = R0 A^(1/3)
R0 = 1.2 × 10^-15 m = 1.2 fm
Distance of closest approach for 5.5 MeV alpha to gold nucleus = 4.0 × 10^-14 m
Mass Defect, Binding Energy, and Binding Energy per Nucleon
ΔM = [Z m_p + (A - Z)m_n] - M
E_b = ΔM c^2
E_bn = E_b / A
E = mc^2
1 u = 931.5 MeV/c^2
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