Question: calculate the energy released in the reaction?

来源:百度知道 编辑:UC知道 时间:2024/06/11 01:25:48
Radium-226 undergoes natural radioactive decay to distintegrate spontaneously with the emission of an alpha partical(α-particle) to form radon(Rn). theα-psrticle decay constant this reaction is 4.30×10^(-4)yr(-1).the masses of the particles involved in the reaction are radium: 226.0254u, radon: 222.0176u, α-particle: 4.0026u.
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问题:计算反应所释放的能量
镭226经过放射性自然衰变发射出α-粒子(阿尔法粒子)形成氡。α-粒子在这个反应中的衰变常数是4.30×10^(-4)yr(-1)。此反应所涉及的微粒质量是:镭226.0254u, 氡222.0176u, α-粒子4.0026u

呃,我试一下啊~ 但是我不会用那个衰变常数
226Ra→222Rn+4He
Δm=226.0254u-(222.0176u+4.0026u)=0.0052u
E=mc2=0.0052u×(3×10^8)×(3×10^8)=4.68×10^(12)u

好难哦``