 This is the graph of the data that I collected when I was measuring the absorbance of the dye at different wavelengths of light. So this is how it looks if you notice there actually two curved areas, two peaks. This is a lower peak here and this is the maximum peak. So remember you are asked to determine the maximum wavelength which is the wavelength that gives you the maximum absorbance of the dye. Which if you notice it would be this top peak. So the maximum wavelength if you were to determine that is actually at... So lambda max is actually 630 nanometers based on the data that I collected. And you can determine the absorbance of the dye at that wavelength which would be approximately 1.8. And this is just an approximate value. When you are doing it you probably will be slightly different but this is for illustration purposes. So from your absorption spectrum you can determine the maximum wavelength and the absorbance at which you have that maximum wavelength.