Question

Ratio of specific charge of proton and an alpha particle is
1) 2:1
2) 1:2
3) 1:4
4) 1:1

Answer 1

Correct answer is option 1. 2:1
Specific charge means Charge/Mass ratio.
Specific charge of proton $=\frac{charge}{mass}=\frac{1}{1}=1$
The specific charge of alpha particle (i.e. $H{e}^{2+})=\frac{2}{4}=0.5$

Therefore, the ratio of the specific charge of protons to alpha particles = 1:0.5 or 2:1