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About the q value problem in nuclear physics 
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#1
Nov2313, 08:33 PM

P: 7

About the Q values , the textbook are using the Q= Δ m c^2 where (Δ m =
mass_initial  mass_final). When Q < 0 is endothermic and when Q > 0 is exothermic nuclear process. But i use the another way round , i use the concept of thermodynamics and physical chemistry, Q > 0 is endothermic and Q < 0 when it is exothermic by using (Δ m = mass_final  mass_initial). This is because to let student easily remember and not confusing (although its violate the definition of q value). But i have make the following step when solve q value problem. i) Please state which side of equation. (LHSRHS or RHSLHS) ii) State either is exothermic or endothermic iii) State whether the process can occur or not. Magnitude will be the same but the sign is difference. It just like a spectrum concept. E(final)E(initial)= ive value (emission spectrum), E(initial)E(final)= +ive value (emission spectrum). I don't know whether i make any mistakes in my concept or not. 


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