(9) Internal Revenue Code means the Internal Revenue Code of 1986 in effect for the federal tax year beginning on January 1, 2007, not including any changes made by federal law after that date, and any regulations adopted under that code applicable to that period.
Absorbance spectroscopy, commonly referred to as spectrophotometry, is the analytical technique based on measuring the amount of light absorbed by a sample at a given wavelength.
In this relationship A is the absorbance (read by a spectrophotometer), c is the solution concentration (mol/L), l is the path length of the sample (cm) and (is the extinction coefficient of the molecule (in this case it has units of L / mol cm). (indicates how easily the molecule absorbs light at a specific wavelength.