1. Tardigrade
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  4. Mass of a particle is 400 times than that of an electron and charge is double that of an electron. The particle is accelerated by a potential difference of 5 V. If particle is initially at rest, then its final KE will be

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Q. Mass of a particle is $400$ times than that of an electron and charge is double that of an electron. The particle is accelerated by a potential difference of $5 \,V$. If particle is initially at rest, then its final KE will be

Dual Nature of Radiation and Matter

Solution:

Change in $KE =$ work done by electric field due to potential difference applied
$KE _{f}- KE _{i}=q V$
$ \Rightarrow KE _{f}-0=q V$
or $KE _{f}=q V\,\,\,\,(q=2 e)$
$\Rightarrow KE =2 e \times 5=10 \,eV$