One can define an alpha-volt $(\alpha-V)$ to be the energy acquired by an $\alpha$-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
    $1 \alpha-V = 1 \,eV / 4000$
  • B
    $1 \alpha-V = 2 \,eV$
  • C
    $1 \alpha-V = 8000 \,eV$
  • D
    $1 \alpha-V = 1 \,eV$

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