A moving neutral small particle of mass of 7 neutrons makes a head on collision with a double ionized Lithium atom in its ground

Question

A moving neutral small particle of mass of 7 neutrons makes a head on collision with a double ionized Lithium atom in its ground state If the minimum KE of the particle for which inelastic collision takes place 7m so that the Lithium atom jumps to its 4th excited state is 51n 2 eV find the value of n BY E 51a m Sm 4 GM Yem MY 10m Va 74 TO

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