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

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