# 查看完整版本 : quantum physics

KG`5~ 2010-1-6 08:31

can someone explain in the simplest way what is quantum physics, and the uncertainty principles?
How are they related?
thank you

mathfeel 2010-1-6 10:23

Yes, but can you say "google" first?
[url=http://www.google.com/search?hl=en&client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&hs=nO1&as_q=uncertainty+principle&as_epq=&as_oq=&as_eq=&num=10&lr=lang_zh-TW&as_filetype=&ft=i&as_sitesearch=&as_qdr=all&as_rights=&as_occt=any&cr=&as_nlo=&as_nhi=&safe=images]http://www.google.com/search?hl=en&client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&hs=nO1&as_q=uncertainty+principle&as_epq=&as_oq=&as_eq=&num=10&lr=lang_zh-TW&as_filetype=&ft=i&as_sitesearch=&as_qdr=all&as_rights=&as_occt=any&cr=&as_nlo=&as_nhi=&safe=images[/url]

In classical physics, motion/trajectory of particle has well defined position and momentum.  At any given time, you can measure both with arbitrary uncertainty.

Quantum physics discovers that this is only true up to a certain limit.  The classical description of point particle with well-defined position and momentum is simple false and not applicable when the product of accuracy of position and momentum approaches Planck's constant.  A more correct description of the motion of a particle is some wave packet with some fundamental fuzziness to its position and momentum.

[[i] 本帖最後由 mathfeel 於 2010-1-5 06:31 PM 編輯 [/i]]

111x111=12321 2010-1-6 17:36

[quote]原帖由 [i]KG`5~[/i] 於 2010-1-6 08:31 AM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=236274435&ptid=11290262][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
can someone explain in the simplest way what is quantum physics, and the uncertainty principles?
How are they related?
thank you [/quote]Related?  YES!!
Uncertainty principles 係  quantum physics 一個 subset.

Uncertainty principles 二樓講左.

Quantum physics.

[[i] 本帖最後由 111x111=12321 於 2010-1-6 05:59 PM 編輯 [/i]]

KG`5~ 2010-1-7 13:31

3q both ching:smile_35: :smile_35:

lightspeed2020 2022-2-13 21:04

[quote]原帖由 [i]KG`5~[/i] 於 2010-1-6 08:31 AM 發表 [url=https://www.discuss.com.hk/redirect.php?goto=findpost&pid=236274435&ptid=11290262][img]https://www.discuss.com.hk/images/common/back.gif[/img][/url]
can someone explain in the simplest way what is quantum physics, and the uncertainty principles?
How are they related?
thank you [/quote]

topochu 2022-2-14 11:39

sylim 2022-3-2 15:45

2010年到2022都學唔到的話就應該放棄了

111x111=12321 2022-3-4 04:13