is used in chemistry to discern the frequency of light emitted when an atom's electron returns to the ground state
. It can also be used to find the frequency of light necessary to excite an electron
to a certain energy level. Balmer's Constant has a value of 3.29 * 1015
and is denoted with a capital C (not to be confused with c, the speed of light
in a vacuum). It is used in the formula:
ν is the frequency of emitted/absorbed light, C is Balmer's constant, ni is the initial principal quantum number and nf is the final principle quantum number. The sign of the answer indicates whether the light is absorbed or emitted. A negative sign denotes emitted light where a positive sign denotes absorbed light.