About the Q values , the textbook are using the Q= Δ m c^2 where (Δ m =(adsbygoogle = window.adsbygoogle || []).push({});

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. (LHS-RHS or RHS-LHS)

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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# About the q value problem in nuclear physics

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