Question

The increasing order (lowest first) for the values of `e//m` (charge//mass) for electron `(e)`, proton `(p)`, neutron `(n)`, and alpha particle `(alpha)` is
A. `n, p, alpha ,e`
B. `e, p, n, alpha`
C. `n, p, e, alpha`
D. `n, alpha, p, e`

Answer 1

Correct Answer - D
`e//m` for electron is `1//0` (as electron has negligible mass), for proton is `1//1`, for neutron is `0//1`, and for alpha particle is `2//4` or `1//2`. Note that charge unit for `e` is `-1`, for proton is `+1`, for neutron is `0`, and for alpha particle is `+2`. The mass unit (amu) for `e` is almost `0`, fro `p` is `1`, for neutron is `1`, and for alpha particles is `4`.