Question:medium

An alpha particle and a proton are accelerated from rest in a uniform electric field. The ratio of the times taken by proton and alpha particle to attain equal displacements is

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For problems comparing the motion of different charged particles in an electric field, first derive a general expression for the quantity of interest (like time, velocity, or kinetic energy) in terms of mass ($m$) and charge ($q$). Then, use the proportionality to set up a ratio. Remember that an alpha particle is a helium nucleus ($^4_2$He), with mass $\approx 4m_p$ and charge $+2e$.

Updated On: Mar 30, 2026

$\sqrt{2}:1$
$1:2$
$1:\sqrt{2}$
$2:1$

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The Correct Option is C

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