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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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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.
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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