The isotope `_(5)^(12) B` having a mass `12.014 u undergoes beta - decay to _(6)^(12) C _(6)^(12) C `has an excited state of the nucleus `( _(6)^(12) C ^(**) at 4.041 MeV` above its ground state if `_(5)^(12)E decay to _(6)^(12) C ^(**) ` , the maximum kinetic energy of the `beta - particle `in unit of `MeV is (1 u = 931.5MeV//c^(2)` where is the speed of light in vacume ) .
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Maximum kinetic energy of `beta - particle` `= [mass of _(3)^(12)B - mass of _(6)^(12) C ] xx 931.5 - 4.041` `= [12.014 - 12 ] xx 931.5 - 4.041] = 9MeV`
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