Hello, guys am really confused why some calculations use ((4*3.14* absorbance)/wavelength) and not ((2.303* absorbance)/ length) to find molar absorptivity to find data for Tauc plot? what is 4 and 3.14 and where do they come from?
the one I understand is for;
alpha (α) = (2.303* absorbance)/ length
kindly explain to me
thanks