In spectroscopy, an isosbestic point is a specific wavelength, wavenumber or frequency at which the total absorbance of a sample does not change during a chemical reaction or a physical change of the sample. The word derives from two Greek words: “iso”, meaning “equal”, and “sbestos”, meaning “extinguishable”.Click to see full answer. Herein, which statement is true of an Isosbestic point?An example of an isosbestic point is when a reactant and its product, regardless of total concentration, both cross at 500nm on an absorption spectra; thus all spectra regarding this reaction should pass through the point at 500nm. D. Only one isosbestic point can be observed per spectra.Subsequently, question is, how do you calculate molar absorptivity? x l x c, where A is the amount of light absorbed by the sample for a given wavelength, ? is the molar absorptivity, l is the distance that the light travels through the solution, and c is the concentration of the absorbing species per unit volume. Also asked, what does the molar extinction coefficient tell you? The term molar extinction coefficient (ε) is a measure of how strongly a chemical species or substance absorbs light at a particular wavelength. The molar extinction coefficient is frequently used in spectroscopy to measure the concentration of a chemical in solution.What is the Beer Lambert law used for?The Beer-Lambert law is a convenient means to calculate the results of spectroscopic experiments (e.g., the concentration of the absorbing species, the extinction coefficient of the absorbing substance, etc.).