B1 中級 3070 分類 收藏
Quantum mechanics is weird, right? But did you know that some of its supposed peculiarities
are not unique to quantum physics but are just properties of waves in general?
Take the uncertainty principle - it says that the better we know where a particle is, the
less we know about how fast it's going. There's a limit to how much we can know! But this
isn't just quantum weirdness - it happens all the time with normal everyday waves!
Remember that the frequency of a wave is how close the wave crests are to each other - a
low frequency wave doesn't have nearly as much oomph as a high frequency one!
And the position of a wave is… well, where the wave is… mostly. So where exactly is
a wave? It's spread out everywhere, right? Ok, but for a wave pulse it's pretty easy
to see where the wave is. So now that we know where the pulse is, what's it's frequency?
Well, a localized pulse doesn't really "wave", so we can't measure the frequency of its crests!
And that's the uncertainty principle in a nutshell - you can either know where a wave
is or where it's going, but not both at the same time!


【TED-Ed】甚麼是不確定定理(What is the Uncertainty Principle?)

3070 分類 收藏
fisher 發佈於 2013 年 4 月 12 日
  1. 1. 單字查詢


  2. 2. 單句重複播放


  3. 3. 使用快速鍵


  4. 4. 關閉語言字幕


  5. 5. 內嵌播放器


  6. 6. 展開播放器


  1. 英文聽力測驗


  1. 點擊展開筆記本讓你看的更舒服

  1. UrbanDictionary 俚語字典整合查詢。一般字典查詢不到你滿意的解譯,不妨使用「俚語字典」,或許會讓你有滿意的答案喔