Chapter 18, Problem 18.17P

(a)

Interpretation Introduction

Interpretation:

Value of absorbance at $350\text{ nm}$ has to be estimated.

Concept Introduction:

Expression to compute absorbance as per Beer’s law is as follows:

  $A=\epsilon \cdot b\cdot c$

Expression to compute transmittance from absorbance is as follows:

  $T={10}^{-A}$

Here,

$\epsilon$ denotes molar absorptivity of species capable top absorb.

$b$ denotes path length in centimeters.

$c$ denotes the concentration of species capable top absorb

$A$ denotes absorbance.

$T$ denotes transmittance.

(b)

Interpretation Introduction

Interpretation:

Fraction of UV radiation transmitted by sunscreen has to be calculated.

Concept Introduction:

Refer to part (a).