Chapter 18, Problem 18.2P

(a)

Interpretation Introduction

Interpretation:

Energy of single photon and $1\text{ mol}$ photon has to be calculated when wavelength is $650\text{ nm}$.

Concept Introduction:

Planck’s hypothesis states energy associated with photon is as follows:

  $E=h\cdot \frac{c}{\lambda }$

Here,

$\lambda$ denotes wavelength.

$h$ denotes Planck’s constant

$c$ denotes speed of light.

(b)

Interpretation Introduction

Interpretation:

Energy of single photon and $1\text{ mol}$ photon has to be calculated when wavelength is $400\text{ nm}$.

Concept Introduction:

Refer to part (a).