(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 is the negative logarithm of the percent transmittance divided by 100. A spectrophotometer can be set to measure either the percent transmittance or the absorbance of a solution. In lab, you will be using a spectrophotometer called the Spectronic 20 or Spec 20 to measure absorbance.
Wave Physics Glossary and Terms. Absorption - Absorption is when some of the wave's energy is taken away when a wave encounters a medium. Amplitude - The measure of the displacement of the wave from its rest position. The higher the amplitude of a wave, the higher its energy. Coherence - Two waves are said to be coherent when they have a constant phase difference between them. Crest - The crest is the highest point of a wave. The opposite of the crest is the trough. Diffraction - Diffraction is when a wave remains in the same medium, but bends around an obstacle. Electromagnetic Waves - Electromagnetic waves are waves that can travel through a vacuum.