One can define an alpha-volt (α-V ) to be the energy acquired by an α-particle when it is accelerated by a potential of 1 V. For this problem, you may take a proton to be 2000 times heavier than an electron. Then,
(a) 1 α-V = 1eV/4000
(b) 1 α-V = 2 eV
(c) 1 α-V = 8000 eV
(d) 1 α-V = 1eV