Chapter 7, Problem 7A.2P

(a)

Interpretation Introduction

Interpretation:

The energy density in the range $1000{\text{cm}}^{-1}$ to $1010{\text{cm}}^{-1}$ inside a cavity at $25°\text{C}$ has to be calculated.

Concept introduction:

Energy density is defined as the total energy inside the container divided by its volume.  The energy density at any temperature, $T$ due to the presence of the electromagnetic radiations of the wavelength ranging between $\lambda$ and $\lambda +\text{d}\lambda$ is known as energy spectral density.

(b)

Interpretation Introduction

Interpretation:

The energy density in the range $1000{\text{cm}}^{-1}$ to $1010{\text{cm}}^{-1}$ inside a cavity at $4\text{K}$ has to be calculated.

Concept introduction:

Energy density is defined as the total energy inside the container divided by its volume.  The energy density at any temperature, $T$ due to the presence of the electromagnetic radiations of the wavelength ranging between $\lambda$ and $\lambda +\text{d}\lambda$ is known as energy spectral density.