A nucleus of mass number 220, initially at rest, emits an -particle . If the Q value of the reaction is 5.5 MeV, the energy of the emitted -particle will be
(a)4.8 MeV
(b)5.4 MeV
(c)6.0 MeV
(d)6.8 MeV

 

Ans b

 

okease tell me how to solve this what is Q value in this

 

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