# Chapter 16 Electrons, Ions, Isotopes and nucleus¶

## Example 16.1 Page no 268¶

In [3]:
#given
E=(200*100)                                      #Electric field in V/m
B=0.2                                            #Magnetic field in T
B1=0.3                                           #Magnetic field in the main chamber in T
q=(1.6*10**-19)                                  #Charge of the electron in coloumbs
m=(12,13)                                        #Carbon isotopes C12 and C13
M=(1.67*10**-27)                                 #AMU(Atomic Mass Unit) in kg

#Calculations
v=(E/B)
s=(2*v*(m[1]-m[0])*M*100)/(q*B1)

#Output
print"Seperation on photographic plate is ",round(s,4),"cm"

Seperation on photographic plate is  0.6958 cm


## Example 16.2 Page no 268¶

In [9]:
#given
a=20                                              #Atomic number of Ca
m=40.0                                            #mass number of Ca
M=39.962591                                       #Mass of Ca nucleus in u
mp=1.007276                                       #Mass of proton in AMU
mn=1.008665                                       #Mass of neutron in AMU

#Calculations
BE=(1/m)*((a*mp)+(a*mn)-M)*1000

#Output
print"BE per nucleon is ",round(BE,1),"MeV"

BE per nucleon is  8.9 MeV