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The ratio of momenta of an electron and ...

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

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Momentum p=mv and `v=sqrt((2QV)/m)`
`p=sqrt(2QmV)`
`rArr p prop sqrt(Qm)`
`rArr p_e/p_alpha=sqrt((exxm_e)/(2exxm_alpha))=sqrt(m_e/(2m_alpha)) `
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