Four particles given, have same momentum w

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Four particles given, have same momentum which has maximum kinetic energy

A

Proton

B

Electron

C

Deutron

D

$\alpha $-particles

Four particles given, have same momentum which has maximum kinetic energy

$E = \frac{{{P^2}}}{{2m}}$

   $E \propto \frac{1}{m}$ (If $P =$ constant)
i.e. the lightest particle will possess maximum kinetic energy and in the given option mass of electron is minimum.