Physic Constants

Name	Symbol	Value
Electron Charge	$e$	$1.602176565(35) \times 10^{-19}$
Speed of light	$c$	$299 792 458 {\rm\; m/s}$
Avogadro Number	$N_A$	$6.02214129(27) \times 10^{23} \textrm{mol}^{-1}$
Planck's Constant	$h$	$6.6260693 \times 10^{-34} \textrm{Js}$
Reduce Planck's Constant	$\hbar =\frac{h}{2\pi}$	$1.054 \times 10^{-34} \textrm{Js} = 6.582 \times 10^{-25} \textrm{GeV}$
Boltzmann constant	$k_B$	$1.38 \times 10^{-23} \textrm{JK}^{-1}$
Fine structure constant	$\alpha = \frac{e^2}{4\pi \epsilon_0 \hbar c}$	$\frac{1}{137}$
Classical radius of the electron	$r_e = \frac{e^2}{4\pi \epsilon_0 Im_ec^2}$	$2.817 940 3227 \times 10^{-15} {\rm\; m}$

De Broglie wavelength $\lambda = \frac{h}{p}$ and energy of a photon $E = hf = \frac{hc}{\lambda} = \frac{1240 \rm eV nm}{\lambda (\rm nm)}$, where f is the frequency and $\lambda$ the corresponding wavelength.