About the q value problem in nuclear physics

  1. 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
    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.
  2. jcsd
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