In a nuclear reactor, a nucleus of uranium(U)-235 fissions into barium(Ba)-141 and krypton(Kr)-92. The equation for this fission is (b) U- Ba+ Kr +xón. (i) Use the graph to show that the fission of one nucleus of uranium-235 will release about 200 MeV of energy. (ii) State the value of x in the equation. (iii) The mass defect in this reaction is 3.1 x 10 28 kg. Calculate the number of uranium-235 nuclei that must fission in order to release 1.0 kJ of energy.
In a nuclear reactor, a nucleus of uranium(U)-235 fissions into barium(Ba)-141 and krypton(Kr)-92. The equation for this fission is (b) U- Ba+ Kr +xón. (i) Use the graph to show that the fission of one nucleus of uranium-235 will release about 200 MeV of energy. (ii) State the value of x in the equation. (iii) The mass defect in this reaction is 3.1 x 10 28 kg. Calculate the number of uranium-235 nuclei that must fission in order to release 1.0 kJ of energy.
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Transcribed Image Text:4. This question is about nuclear fission and fusion.
(a)
The graph shows the variation of binding energy per nucleon for nuclides with a nucleon number
greater than 40.
9.5-
9.0-
binding energy 8.5-
per nucleon /
MeV
8.0-
7.5-
7.0+
40
60
80
100 120 140 160 180 200 220 240
nucleon number
(i)
Define binding energy.
(ii)
Part b allparts
(iii) State why the nuclide you have labelled is the most stable.
(b)
In a nuclear reactor, a nucleus of uranium(U)-235 fissions into barium(Ba)-141 and krypton(Kr)-92.
The equation for this fission is
235
92
UBa+Kr +xn.
141
Use the graph to show that the fission of one nucleus of uranium-235 will release about 200
MeV of energy.
(i)
(ii)
State the value of x in the equation.
28
(iii) The mass defect in this reaction is 3.1 x 10 kg. Calculate the number of uranium-235 nuclei
that must fission in order to release 1.0 kJ of energy.
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