What is the correct absorbance for a 0.1 mM solution with ε=6220 and l=0.5 cm?
Numerical application of Beer-Lambert law enables concentration or absorbance prediction using A equals ε c l. Given ε 6220 M-1 cm-1 characteristic of NADH at 340 nm, c 0.1 mM which equals 1×10^-4 molar, and path length 0.5 cm, multiplication proceeds: 6220 times 1e-4 equals 0.622, multiplied by 0.5 equals 0.311. Rounded to two decimals yields 0.31 absorbance units within optimal photometric accuracy range. Such calculations essential for enzymology, monitoring NADH formation, adjusting substrate levels to maintain linearity and avoid detector saturation while ensuring measurable signal change for kinetic quantification.
Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.