
Useful Constants
 speed of light (c) = 3.0 x 10^{8} m/s
 Planck's Constant (h) = 6.626 x 10^{34} Joules second
 Charge of an electron (q) = 1.602 x 10^{19} coulombs
Useful Units
 frequency = cycles/second (Hz)
 wavelength = length (m)
 volt = a unit of potential of electric field, such that that it takes
1 Joule to push a charge of 1 Coulomb across 1 volt
Conversion Factors
 1 angstrom (A) = 1 x
10^{10} meters
(often used for the optical region of the spectrum)
 1 KeV = 1,000 eV = 1.6 x 10^{16} Joules
