Alpha particle to proton charge mass ratio
Step 1: We will first determine the charge mass ratio of the proton and alpha particle:
We know that The proton's charge is +e
And m = proton mass
The proton has a particular charge of e/m.
e = 1.6 x 10-19 C and m = 1.67 x 10-27 kg
Thus specific charge mass ratio of proton = 9.67 x 107 Ckg-1
- The charge of helium is +2e.
- The mass of helium is 4m.
- The specific charge of helium is 2e/4m.
Specific charge of an alpha particle = 2 x 1.67 x 10-27 C/4 x 1.66 x 10-27 kg
Thus the specific charge of alpha particle = 4.82 x 107 C/kg.
Step 2: now we have to find the ratio of these two(alpha particle and proton):
Thus the ratio = (e/m)/(4m/2e) = 9.67 x 107 C/kg-1/ 4.82 x 107 C/kg.
As a result, the charge-to-mass ratio of a proton particle is 2:1, which is twice that of an alpha particle.
What is charge to mass ratio of proton and alpha particles?
The charge-to-mass ratio of a proton is two times greater than that of an alpha particle, hence the ratio between their masses is 2:1. The discovery of protons dates back to the year 1815 when the English chemist William Prout suggested that all atoms are made up of hydrogen atoms.