點解destructive interference 既 path difference會多左 1/2 出黎既???
我聽呀sir話佢話係兩個出發既位置有唔同.一個遠d一個近d, 所以多出左1/2出黎...甘姐係點解?????
點解destuctive interference 既 path difference係 ( m + 1/2 )λ , 而constructive interference既 path difference 係 mλ????
唔該請高手幫我解答下呢三個問題...thx!!!!!
F4 Phy...Wave
2008-03-18 2:06 am
回答 (2)
2008-03-18 2:53 am
✔ 最佳答案
簡單來說, 若果兩個wavelength and amplitude一樣的wave重疊一齊, 新的wave form 是波長一樣, 而波幅就會增大.
這是一個constructive interference.
相反, 若果兩個wave 相差半個波長, 而混合一起,
在試波器上會看出一條直線. 這是destructive interference
的後果.所以path difference是半個波長.
2008-03-18 8:13 am
我想提你.
destuctive interference 既 path difference唔一定係 ( m + 1/2 )λ
而constructive interference既 path difference 都唔一定係 mλ
首先係要睇下兩個source係in phase定out of phase先可以決定!~
circular wave係數返佢有幾多個wave出左黎咋bor....
好似數格仔咁數嫁咋! 有幾多間咪幾多個wavelength囉
destuctive interference 既 path difference唔一定係 ( m + 1/2 )λ
而constructive interference既 path difference 都唔一定係 mλ
首先係要睇下兩個source係in phase定out of phase先可以決定!~
circular wave係數返佢有幾多個wave出左黎咋bor....
好似數格仔咁數嫁咋! 有幾多間咪幾多個wavelength囉
參考: 自己
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