Chapter 11, Problem 11A.2P

Interpretation Introduction

Interpretation:

An expression for the variation of $I$ with sample length $L\gg x_0$ has to be developed.

Concept introduction:

Absorbance is the amount of light absorbed by molecules.  On passing light through a sample with incident intensity $I_o$ is passed through a sample some amount of light is absorbed and some is transmitted.  The intensity of transmitted light is $I$.  The transmittance of sample is given by $T=\frac{I}{I_o}$.  The absorbance of the sample is given by $A=-\log T$.  According to Beer-Lambert Law, the absorbance of species is linearly proportional to the concentration of absorbing species.  Absorbance is given by $A=\epsilon \left[\text{J}\right]L$.