唔明咩係coherent source,

coherent source 姐係講兩個 source 既 phase difference 永遠不變
(eg. 一開始係 antiphase 就以後都係 antiphase )
第二個問題都唔係好明你問咩 , 不過盡量答啦
total phase difference = initial phase difference + path difference
如果一開始係 antiphase 既話
total phase difference = wavelength/2 + path difference
如果一開始in phase
total phase difference = 0 + path difference = path difference

coherent source姐係:





















































































78-4[a-2(a+8)]=[(3a-8-(2a-4)]-(x+4)-(13-4x)=3(x-4)-5(8+x)+65x-{1-2[x-2(x-3)]}=170.02x-0.5=0.12x+0.1-0.4x3(4s-7)+7s+2(8s+2)x45+2d






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