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A particle of mass 220 meV//c^2 collides...

A particle of mass `220 meV//c^2` collides with a hydrogen tom at rest. Soon after the collisionthe particle comes to rest, and the atom recoils and goes to its first excited state. The initial kinetic energy of the particle (in eV) is `N/4`. The value of N is :
(Given the mass of the hydrogen atom to be `1GeV//c^2`)_____________

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