Specific Charge- Calculated Examples
Specific Charge- Calculated Examples
The specific charge of a particle is its charge to mass ratio :
Symbol for charge Q
Symbol for mass m
specific charge =[pic]
example 1: Calculate the specific charge of the proton.
For a proton Q = +1.6 x 10-19C m = 1.7 x 10-27kg
specific charge =[pic]=[pic] = +9.41 x 107 Ckg-1
example 2: What is the specific charge of an [pic] nucleus?
The nucleus contains 3 protons so its total charge is 3 x (+1.6 x 10-19} C
It contains a total of 7 nucleons so its total mass is = 7 x (1.7 x 10-27)
specific charge =[pic]=[pic] = 4.0 x 107Ckg-1
example 3: What is the specific charge of an [pic] ion?
The overall charge of the ion is -2 in relative units or 2 x 1.6 x 10-16 C
The mass of the nucleus of the ion is 16 x 1.7 x 10-27.kg
The combined mass of the electrons is so small it is insignificant in this calculation. So:
specific charge =[pic]= [pic] = -1.2 x 10-7Ckg-1
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