Final answer:
Absorption spectroscopy provides quantitative information such as Amax and absorbance at Amax, which can give insights into the structure and energetic transitions of a molecule.
Step-by-step explanation:
Quantitative information gained from absorption spectroscopy includes the wavelength at maximal light absorbance (Amax) and the absorbance at Amax. Amax is the wavelength at which the molecule absorbs the most light, and absorbance is a unitless number that indicates how much light is absorbed at Amax. These pieces of information can provide insights into the structure and energetic transitions of the molecule being studied.