The ratio of the specific charge of an alpha- | vedclass

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(C) The specific charge is defined as the ratio of charge to mass,denoted as $\frac{q}{m}$.For a proton $(p)$,the charge is $q_p = e$ and the mass is

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(C) The specific charge is defined as the ratio of charge to mass,denoted as $\frac{q}{m}$.For a proton $(p)$,the charge is $q_p = e$ and the mass is $m_p = m$.For an $\alpha$-particle,the charge is $q_{\alpha} = 2e$ and the mass is $m_{\alpha} = 4m$.The specific charge of a proton is $(\frac{q}{m})_p = \frac{e}{m}$.The specific charge of an $\alpha$-particle is $(\frac{q}{m})_{\alpha} = \frac{2e}{4m} = \frac{1}{2} \frac{e}{m}$.The ratio of the specific charge of an $\alpha$-particle to that of a proton is $\frac{(\frac{q}{m})_{\alpha}}{(\frac{q}{m})_p} = \frac{\frac{1}{2} \frac{e}{m}}{\frac{e}{m}} = \frac{1}{2}$.

Column-$I$	Column-$II$
$A$. Isotopes	$i$. $Li^7, Be^7$
$B$. Isobars	$ii$. $_8O^{18}, _9F^{19}$
$C$. Isotones	$iii$. $_1H^1, _1H^2$

The ratio of the specific charge of an $\alpha$-particle to that of a proton is

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