Question

The increasing order of specific charge for electron($e$), proton($p$), neutron($n$) and alpha particle($\alpha$) is

• A. $e,p,n$ $,\alpha$
• B. $n,$ $\alpha$ $,p,e$
• C. $n,p,e$$,\alpha$
• D. $n,p$, $\alpha ,$ $e$

Answer 1

The correct option is B $n,$ $\alpha$ $,p,e$

Specific Charge = $\frac{q}{m}$

Charge on neutron = 0

$S{C}_{neutron}$ = 0

$S{C}_{proton}=\frac{e}{m_P}$

$S{C}_{\alpha -particle}=\frac{2e}{4m_P}$

$S{C}_{electron}=\frac{e}{{10}^{-3}{m}_P}[m_e\approx {10}^{-3}{m}_P]$

Hence, the specific charges in increasing order are $n,\alpha ,p,e$