Question

What do you mean by Q – value of a nuclear reaction?

Answer 1

In nuclear physics and chemistry, the Q valuefor a reaction is the amount of energy absorbed or released during the nuclear reaction. The value relates to the enthalpy of a chemical reaction or the energy of radioactive decay products. It can be determined from the masses of reactants and products. Q values affect reaction rates. In general, the larger the positive Q value for the reaction, the faster the reaction proceeds, and the more likely the reaction is to "favor" the products.

{\displaystyle Q=(m_{r}-m_{p})\cdot 931MeV}

where the masses are in atomic mass units. Also both {\displaystyle m_{r}} and {\displaystyle m_{p}} are the sums of the reactant and product masses respectively

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