Chapter 15, Problem 15.36P

Interpretation Introduction

Interpretation:

Breaking the $\text{C=C π}$ bond in a retinal molecule in the eye requires approximately, $\text{250 kJ/mol}$.  The longest wavelength (in $\text{nm}$) of visible light that has the energy to break the π bond has to be found.

Concept Introduction:

To find the wave length, the relationship between energy and wavelength is used.

Relation between energy and wavelength is given as,

  $\text{E=}\frac{\text{hc}}{\text{λ}}$

Where, $\begin{array}{l}\begin{array}{l}\text{E}\text{ = energy}\\ \end{array}\hfill \\ \begin{array}{l}\text{ h}\text{ = Planck’s constant}\\ \end{array}\hfill \\ \begin{array}{l}\text{c}\text{ = speed of light}\\ \end{array}\hfill \\ \text{λ}\text{ = wavelength}\hfill \end{array}$