Q: The specific charge of a proton is 9.6 × 10^{7} C /Kg. The specific charge of an alpha particle is

Sol: Specific change = q/m ;

$\large \frac{S_\alpha}{S_p} = \frac{q_\alpha}{q_p} . \frac{m_p}{m_\alpha}$

$\large \frac{S_\alpha}{9.6 \times 10^7} = \frac{2}{1} . \frac{1}{4} = \frac{1}{2}$

$\large S_\alpha = \frac{1}{2} \times 9.6 \times 10^7 $

= 4.8 × 10^{7} C /Kg