PTE Re-tell Lecture 真实讲座练习题:颗粒旋转

在PTE中,无论是Summarise Spoken Text 还是 Re-tell Lecture的考题大都是从真实的讲座或者演讲中截取的中间经常经常夹杂很多不同的环境音.很多同学都反映有时未必是听不懂,而是听不到. 鉴于此,墨尔本悉尼文波雅思PTE专门为大家总结了真实讲座的PTE练习音频,相比新闻音频来说,整体更加接近PTE考试的真题,内容方面,我们也会为大家提供考试中存在的近似题,最近我们会持续更新,敬请期待!

Sure another vital experiment, is the stern-gerlach experiment and that’s an experiment where we learned that particles like electrons have a new intrinsic quantum quality that we just didn’t know about when we were thinking purely classically, namely they have a quality called spin, roughly you can think about the spin of an electron or any other particle as if it’s a little tiny top spinning around. But that’s limited in its utility, gives us a good mental image. But the quantum quality of spin is something that only emerges in quantum mechanics. And it basically tells us that the electron can either have a spin up or a spin down. And this stern-gerlach experiment allowed us to prove that, through the motion of electrons, those would spin up would move one way through this apparatus, those would spin down would move a different way through this apparatus. In that way, we recognise that in addition to mass, in addition to electric charge, particles like electrons also have spin.


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