Answer :
Nuclear energy is derived by d. fission of atoms of U-235.Nuclear energy is generated through a process called nuclear fission, which involves the splitting (or breaking) of atomic nuclei, typically of uranium-235 (U-235) or other fissile materials.
When a U-235 nucleus absorbs a neutron, it becomes unstable and splits into two smaller nuclei, releasing a significant amount of energy in the form of heat, as well as additional neutrons. This chain reaction of successive fission events produces a substantial amount of heat, which is harnessed to generate electricity in nuclear power plants.
Option a, "the breaking of U-235 bonds," is somewhat accurate but lacks specificity regarding the nuclear fission process. Option b, "fusion of atoms of U-235," is incorrect as nuclear fusion involves the combining of atomic nuclei, not their splitting. Option c, "combustion of atoms of U-235," is also incorrect because combustion involves chemical reactions, whereas nuclear energy is a result of nuclear reactions (fission or fusion) that release much more energy per unit mass than chemical reactions. Therefore, option d, "fission of atoms of U-235," is the correct choice for describing the process of deriving nuclear energy.
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