CAIE A-Level Physics A2 23.1.7 The Energ…E C 2 M

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A nucleus of uranium-235 absorbs a neutron and becomes unstable. It then undergoes a fission reaction. One possible reaction is

{ }_{92}^{235} \mathrm{U}+{ }_{0}^{1} \mathrm{n} \rightarrow{ }_{54}^{142} \mathrm{Xe}+{ }_{38}^{90} \mathrm{Sr}+\text { neutrons. }

Data for the binding energies per nucleon for this fission reaction are given in Table 8.1.

Table 8.1

Calculate the energy released, in MeV , from the fission of one nucleus of uranium-235. MeV

energy $=(142 \times 8.37)+(90 \times 8.72)-(235 \times 7.59)$
=190 MeV

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CAIE A-Level Physics A2 23.1.7 The Energy Released in Nuclear Reactions Using E C 2 M Topic Practice