74.nuclear fission

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  • Author : Khairi

    NUCLEAR FISSION

    A process of splitting of a heavy nucleus into two lighter nuclei The heavy nucleus is bombarded by a neutron

    At end of the process,it produces ;

    Two new nuclei Three neutrons Nuclear energy

  • Author : Khairi

    Uranium-235

    neutron

    NUCLEAR FISSION

  • Author : Khairi

    NUCLEAR FISSION

  • Author : Khairi

    2 new nuclei,3 neutrons and energy produced

    NUCLEAR FISSION

  • Author : Khairi

    neutron

    Uranium-235

    Krypton-92

    Barium-141

    neutron

    neutron

    neutron

    NUCLEAR FISSION

  • Author : Khairi

    NUCLEAR FISSION EQUATION

    U23592 Kr9236Ba14156n10+ + + n103 + energy

    EXERCISE

    Calculate the nuclear energy produced in the nuclear fissionabove in Joule and eV.

    2.69 x 10-11 J

    Uranium-235 = 235.04 a.m.uKrypton-92 = 91.93 a.m.uBarium-141 = 140.91 a.m.uNeutron = 1.01 a.m.u

    NUCLEAR FISSION

  • Author : Khairi

    Mass defect = mass before mass after

    = [235.04 + 1.01] [140.91 + 91.93 + 3(1.01)]

    = 0.18 a.m.u

    = 0.18 x 1.66 x 10-27 kg

    = 2.988 x 10-28 kgE = mc2

    = 2.988 x 10-28 x (3.0 x 108)2

    = 2.69 x 10-11 J

    NUCLEAR FISSION

    = 1.68 x 108 eV

    U23592 Kr9236Ba14156n10+ + + n103 + energyNUCLEAR FISSION EQUATION

  • Author : Khairi

    CHAIN REACTION

    A chain reaction occurs when a further nuclear fission is continuously occurred.

    This is happen when the neutron which is produced in earliernuclear fission bombarding the new nuclei.

    Again,the process will produce 2 new nuclei,3 neutron and nuclearenergy.

    Chain reaction only can happen when the mass of uranium isexceeded the critical mass.

    NUCLEAR FISSION

  • Author : Khairi

    neutron

    NUCLEAR FISSION

    CHAIN REACTION

  • Author : Khairi

    neutron

    NUCLEAR FISSION

    CHAIN REACTION

  • Author : Khairi

    In the fission reaction for an atom of uranium-235,the energyproduced is 2.9 x 10-11 J.What is the total loss of mass in the reaction ?

    A. 3.22 x 10-28 kgB. 9.67 x 10-20 kg

    C. 2.61 x 106 kgD. 1.03 x 1019 kg

    E = mc2

    2.9 x 10-11 = m x (3 x 108)2

    m = 3.22 x 10-28 kg

    PAST YEARS QUESTIONPAST YEARS QUESTION

  • Author : Khairi

    a. What is meant by nuclear fission ?

    A process of splitting a heavy nucleus into two lighter nuclei

    b. What is meant by nuclear fusion ?

    A process of combining two heavy nuclei to form a heavier nucleus

    PAST YEARS QUESTIONPAST YEARS QUESTION

  • Author : Khairi

    c. Using the information in the table,compare the nuclear fission and nuclear fusion.Hence state the relationship between mass and energy evolved.

    1. Nuclear fission is a process of splitting a heavy nucleus to lighter nuclei while nuclear fusion is a process of combining light nuclei to heavier nucleus

    2. Both reactions release nuclear energy

    3. Nuclear energy released due to mass loss

    PAST YEARS QUESTIONPAST YEARS QUESTION

  • Author : Khairi

    Describe how the chain reaction happens in a nuclear fission of an atom of uranium.

    neutron

    Heavy nucleus

    3 neutrons

    Light nucleus

    Heavy nucleus

    Heavy nucleus is bombarded by neutron

    Two lighter nuclei and three neutron are producedNeutron continue to hit the new nuclei and produce twolighter nuclei and three neutron

    PAST YEARS QUESTIONPAST YEARS QUESTION