讀左7年物理,你問題我答

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22 Like 6 Dislike
2017-04-24 16:42:05
樓主點睇ust嘅physics

你個名囉

2017-04-24 16:46:22
樓主點睇ust嘅physics

有d機會上過下UST的physics course,大約到year 2 sem 1左右的level

課程還好,但講成個校園既風氣會CU比較好,果邊physics d人真係天外有天

當時都想入cu 但係唔夠分
2017-04-24 16:47:19
how does the nuclear reactor get the neutrons and accelerate them?

there are several types of sources
1. source from spontaneous decay/fission
2. bombarding accelerated atoms to another atom (e.g. plutonium to beryllium)
3. neutron activation
4. chain reaction

acceleration can be done by thermal or DT/DD fusion to generate high energy neutron
2017-04-24 16:48:45
點解低流速會高壓 同埋相反
點解流線型會流得順啲?

唔該 以前dse 無學過
2017-04-24 16:49:28
估唔到你竟然讀Physics
2017-04-24 16:52:13
點解低流速會高壓 同埋相反
點解流線型會流得順啲?

唔該 以前dse 無學過

navier stoke/bernoulli equation個解來

streamline係因為一d boundary dragging同turbulence的問題所以"流線型"會順d
2017-04-24 16:53:19
how does the nuclear reactor get the neutrons and accelerate them?

核燃料本身自己會放出中子.
佢地唔會加速中子,反而要用deteurium water黎減速,如果唔係會大爆炸/冇反應

講多少少,Pressurised Heavy Water Reactor先用Deuterium (Heavy Water) 去moderate to thermal spectrum...

其他PWR,BWR會用normal water去moderate但嗰enrichment就會大多Heavy Water Reactor少少
(3-5% Vs 0.7%)

而fast reactor就唔洗做moderation,只係要coolant...
2017-04-24 16:53:40
how does the nuclear reactor get the neutrons and accelerate them?

there are several types of sources
1. source from spontaneous decay/fission
2. bombarding accelerated atoms to another atom (e.g. plutonium to beryllium)
3. neutron activation
4. chain reaction

acceleration can be done by thermal or DT/DD fusion to generate high energy neutron

仲有一隻係atomic beam經高voltage field accelerate, 打上cathode target後會出neutron beam,再做collimation
2017-04-24 16:54:36
how does the nuclear reactor get the neutrons and accelerate them?

核燃料本身自己會放出中子.
佢地唔會加速中子,反而要用deteurium water黎減速,如果唔係會大爆炸/冇反應

講多少少,Pressurised Heavy Water Reactor先用Deuterium (Heavy Water) 去moderate to thermal spectrum...

其他PWR,BWR會用normal water去moderate但嗰enrichment就會大多Heavy Water Reactor少少
(3-5% Vs 0.7%)

而fast reactor就唔洗做moderation,只係要coolant...

香港原來有核電專家
2017-04-24 16:57:28
因為我都係物理系同路人,見樓主你讀到上pg仲搵到工所以有幾樣想問

1. 問d background嘢先,你undergrad嘅時候CGPA幾多?

2. 利申番先,我自己就掛住玩唔讀書,所以由一開始滿腔熱誠到依家淪為學渣。但我真係深深體會到物理依科真係唔係普通人讀得店。可能如果我當初比多d時間讀書唔洗墊底,但講緊gpa上3.3 or above真係冇天分係做唔到。大家讀過物理都明,好多時d問題有d位係靠天分突然叮一聲諗到個key point之後就解答到。想問下樓主對於「讀物理讀得好一定要靠天分」有咩睇法?

3. 見樓主好似有讀medical physics嘅嘢?唔知你點睇medical phy對將來搵工有冇幫助?前景如何?

Sor打得有d長 希望樓主會答 thx a lot!!
2017-04-24 17:00:15
點解低流速會高壓 同埋相反
點解流線型會流得順啲?

唔該 以前dse 無學過

navier stoke/bernoulli equation個解來

streamline係因為一d boundary dragging同turbulence的問題所以"流線型"會順d

sorry 第一個可唔可以詳細少少
關唔關平時啲氣由高壓區去低壓區事
2017-04-24 17:01:26
因為我都係物理系同路人,見樓主你讀到上pg仲搵到工所以有幾樣想問

1. 問d background嘢先,你undergrad嘅時候CGPA幾多?

2. 利申番先,我自己就掛住玩唔讀書,所以由一開始滿腔熱誠到依家淪為學渣。但我真係深深體會到物理依科真係唔係普通人讀得店。可能如果我當初比多d時間讀書唔洗墊底,但講緊gpa上3.3 or above真係冇天分係做唔到。大家讀過物理都明,好多時d問題有d位係靠天分突然叮一聲諗到個key point之後就解答到。想問下樓主對於「讀物理讀得好一定要靠天分」有咩睇法?

3. 見樓主好似有讀medical physics嘅嘢?唔知你點睇medical phy對將來搵工有冇幫助?前景如何?

Sor打得有d長 希望樓主會答 thx a lot!!

1. grad果陣CGPA 2.8

2. 你要做到歷史留名一定要天才,其他果d努力更重要,人地計緊數果陣你做緊乜?
一分天分九分努力,無論你讀咩都係咁

3. 係香港就算鳩數,一個位成百人爭,有fd好好運入到,但入左去都唔係做physics野的,文書野仲多
2017-04-24 17:01:31
7 years means:

Dse 3 years
Bachelor 4 years

HKCEE + HKALE 4 years + Bachelor 3 years

al讀4年

智障
2017-04-24 17:03:33
巴打點睇香港做computer vision
2017-04-24 17:09:21
其實點解UG 讀physics 會去左做AI, PG 係CS?
2017-04-24 17:11:25
點解 00 raiser 識用量子化
但巴巴托斯狼王唔用量子化
用左咪避得開破滅魔劍

PS 咁高科技既破滅魔劍都整到
量子化好小兒科啫
2017-04-24 17:13:49
點解低流速會高壓 同埋相反
點解流線型會流得順啲?

唔該 以前dse 無學過

navier stoke/bernoulli equation個解來

streamline係因為一d boundary dragging同turbulence的問題所以"流線型"會順d

sorry 第一個可唔可以詳細少少
關唔關平時啲氣由高壓區去低壓區事


v降個P就要升
2017-04-24 17:14:19
想問下地球表面嘅curvature tensor係點計/度出嚟?

用satellite scan掛,唔太知
2017-04-24 17:15:01
巴打點睇香港做computer vision

香港呢方面唔差,CU CS打比賽成績幾好
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