When the nuclei are merged, the excess energy is released. Like fission, nuclear fusion can also transmute one element into another. For example, hydrogen nuclei fuse in stars to form the elementhelium. Fusion is also used to force together atomic nuclei to form the newest elements on the pe...
heavier than iron absorbs energy. The opposite is true for the reverse process, nuclear fission. This means that fusion generally occurs for lighter elements only, and likewise, that fission normally occurs only for heavier elements. There are extreme astrophysical 天体物理学 events that can lead ...
Atoms heavier than iron can undergo fission, while lighter ones can fuse. Nuclear power stations generate energy from fission reactions. About 2 billion years ago, natural fission took place at Oklo in Gabon, Africa, when groundwater concentrated uranium deposits. Fusion occurs in the Sun's ...
Nuclear Fission and FusionChang Caixiang
较轻原子核的组合比单个原子核更轻，形成过程释放出能量。例如，氢原子（比铁轻）的聚变是太阳能源的来源。两种过程的对比展示出，虽然核裂变通常涉及较大原子核的分裂，而核聚变更倾向于轻原子核的结合，但它们都是自然界中的能量转换机制，对地球的能源生产和宇宙的运行起着至关重要的作用。
Unlike fission, nuclear fusion also has the added benefit of being self-sustaining without creating harmful waste. However, achieving and controlling fusion has been a lot more difficult for scientists to crack than fission. One problem facing fusion technology is that in order to create self-susta...
nuclear fission:核裂变，又称核分裂，是指由重的原子核，主要是指铀核或钚核，分裂成两个或多个质量较小的原子的一种核反应形式。原子弹、裂变核电站或核能发电厂的能量来源就是核裂变。其中铀裂变在核电厂最常见，热中子轰击铀235原子后会放出2到4个中子，中子再去撞击其它铀235原子，从而形成链式...
December15,2015 1.Howisnuclearfusiondifferentfromnuclear fission? 2.Whatcauseselementstobe“radioactive”? Goals •Todescribehalflifeandsolveproblems usinghalflife RadioactiveDecayRates •Halflife-Thetimerequiredforhalfofthe sampleofradioactivenucleitodecay. RadioactiveDecayRates •1sthalflife½sample...
Nuclear Fission and Fusion Fission Fission means divided. When a heavy nucleus is bombarded by neutrons the strong nuclear force weakens, but the electric repulsion remains strong. A fast moving neutron collides with the atom and splits it into smaller fragments High levels of energy released (7...
Nuclear fission and fusion(聚变与裂变)NuclearFissionandFusion ChangCaixian MainContents 1.2.3.4.5.Energy-massequivalenceNuclearbindingenergyBindingenergypernucleonNuclearfusionNuclearfission Energy-massequivalence particle protonneutronelectron Mass/atomicmassunits(u)1.0072761.0086650.00054858 Mass/SIunits(kg)...