3. Useful constants

Electron mass: m = 9.107 × 10 ^–31 kg.

Electron charge: e = 1.602 1 × 10 ^–19 C.

Stefan-Boltzmann constant: σ = 5.669 × 10 ^–12 W/cm ² · K ⁴ .

Boltzmann constant: k = 1.381 × 10 ^–23 J/ K.

Ratio of proton mass to electron mass: 1,836.

Energy associated with 1eV: E = 1.602 × 10 ^–19 J = 23.06 Kcal.

Speed of the 1ev electron: v ₀ = 5.931 × 10 ⁵ ...