Chapter 11, Problem 11.69QE

(a)

Interpretation Introduction

Interpretation:

The edge length of the unit cell has to be given.

Concept Introduction:

The density of the unit cell is given by,

  $\text{Density}\text{}\text{}\text{}\text{of}\text{the}\text{unit}\text{cell=}\frac{\text{mass}\text{of}\text{the}\text{unit}\text{cell}}{\text{volume}\text{of}\text{the}\text{unit}\text{cell}}$

Volume of the cubic unit cell is the length of the edge raised to the third power

(b)

Interpretation Introduction

Interpretation:

The radius of the iron atom has to be calculated.

Concept Introduction:

The radius of atom in bcc is given by,

  $\text{Radius}\text{of}\text{atom}\text{in}\text{bcc(r)=}\frac{\sqrt{\text{3}}\text{a}}{\text{4}}$$\text{pm}$

where a is the edge length of the atom.