The ratio of momenta of an electron and an \[\alpha -\]particle which are accelerated from rest by a potential difference of 100 V is [MNR 1994; RPET 1997]

• A.            1    
• B.            \[\sqrt{\frac{2{{m}_{e}}}{{{m}_{\alpha }}}}\]
• C.            \[\sqrt{\frac{{{m}_{e}}}{{{m}_{\alpha }}}}\]    
• D.            \[\sqrt{\frac{{{m}_{e}}}{2{{m}_{\alpha }}}}\]