Chapter 6.2, Problem 1RC

Interpretation Introduction

Interpretation: The energy of a mole of photons of UV-B light is to be determined from the given option.

Concept introduction:

• Planck’s equation,

$\begin{array}{c}\text{E}\text{=}\text{hν}\\ \text{where, E}\text{=}\text{energy}\\ \text{h}\text{=}\text{Planck's}\text{constant}\\ \text{ν}=\text{frequency}\end{array}$

The energy increases as the wavelength of the light decrease. Also the energy increases as the frequency of the light increases.

• The frequency of the light is inversely proportional to its wavelength.

$\begin{array}{c}\text{ν}\text{=}\frac{\text{c}}{\text{λ}}\\ \text{where, c}\text{=}\text{speed}\text{of}\text{light}\\ \text{ν}=\text{frequency}\\ \text{λ}=\text{wavelength}\end{array}$