Chapter 14 Crystal structure

Example 14.1 Page no 27

In [4]:
#Given
a=3.56

#Calculation
import math
A=a/math.sqrt(2)

#Result
print"(a) There are 8 atmos"
print"(b) Length is",round(A,2),"A"

(a) There are 8 atmos
(b) Length is 2.52 A

Example 14.6 Page no 28

In [7]:
#Given
a=3
b=2.0

#Calculation
import math
d=math.sqrt(a/b)

#Result
print"(i) Ratio of intercepts of three axes is 1:1/2:1/3"
print"(ii) Ratio of spascing is",round(d,3)

(i) Ratio of intercepts of three axes is 1:1/2:1/3
(ii) Ratio of spascing is 1.225

Example 14.12 Page no 30

In [10]:
#Given
c=8
a=3.0

#Calculation
import math
A=math.sqrt(c/a)

#Result
print"A=",round(A,3)

A= 1.633

Example 14.13 Page no 30

In [13]:
#Given
v=1.794*10**-28                           #m**3
Kb=8.625*10**-5
T=298
A=16.65

#Calculation
import math
E=math.log(10)*A*2*Kb*T

#Result
print"Average energy required is",round(E,3),"eV"

Average energy required is 1.971 eV

Example 14.14 Page no 31

In [23]:
#Given
a=560
Kb=8.625*10**-5
T=586
A=1146

#Calculation
import math
n=1.4*a/(math.log(10)*Kb*T*A)

#Result
print"Ratio is", round(n,3)

Ratio is 5.878