The ratio of specific charge of an `alpha-` particle to that of a proton is

Options

A. `2:1`
B. `1:2`
C. `1:4`
D. `1:1`

Answer

B

Explanation

Specific charge of proton `= (e)/(m) = (1)/(1) = 1`
Specific charge of `alpha`-particle `= (e)/(m) = (2)/(4) = (1)/(2)`
`:.` Specific charge of proton : `alpha`-particle
`1:(1)/(2)` or `2:1`