The ratio of momenta of an electron and an $\alpha - $particle which are accelerated from rest by a potential difference of $100 V$ is
The ratio of momenta of an electron and an $\alpha - $particle which are accelerated from rest by a potential difference of $100 V$ is
- 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 }}}} $
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