作者winnerken (ken)
看板TransPhys
標題[考古] spectrum
時間Fri May 10 16:45:07 2013
The mercury spectrum has a green line at 546nm,and an ultraviolet
line at 365nm. what is the first order angular separation between
the two spectral lines obtained with a diffraction grating with
10000 rulings/cm ?
不太清楚這題要問甚麼? 是光學的題目 還是近物?
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◆ From: 175.98.11.135
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作者: metastable (清士) 看板: TransPhys
標題: Re: [考古] spectrum
時間: Fri May 10 18:44:59 2013
※ 引述《winnerken (ken)》之銘言：
: The mercury spectrum has a green line at 546nm,and an ultraviolet
: line at 365nm. what is the first order angular separation between
: the two spectral lines obtained with a diffraction grating with
: 10000 rulings/cm ?
: 不太清楚這題要問甚麼? 是光學的題目 還是近物?
根據光柵工式或(單縫公式)
bsinθ=(2k+1)λ/2
題目是要找兩個光各自在屏上做第一級暗紋的夾角
代K=0 λ=546nm 跟 365nm
10000 rulings/cm 要換成 b = 10^(-6)
↑指這個光柵每公分有10000條狹縫
把它倒數後 再換成公尺
arcsin 0.273 - arcsin 0.815 就是答案了
有錯請指教
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※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 140.114.123.44
※ 編輯: metastable 來自: 140.114.123.44 (05/10 18:47)
推 winnerken:感謝! 05/11 01:39
→ winnerken: 還是問一下 10000 rulings/cm 是... 05/11 01:58
→ metastable:就是光柵的b常數 05/12 18:43
→ metastable:我的單位填錯了 應該是10^(-6) 05/12 18:44
※ 編輯: metastable 來自: 140.113.73.86 (05/12 19:14)
※ 編輯: metastable 來自: 140.114.123.92 (05/13 11:36)