Yu3 0 Posted June 23, 2016 Report Share Posted June 23, 2016 求解 若恆星甲的光度是恆星乙的8倍，而恆星甲的亮度是恆星乙的2倍，則恆星甲與地球的距離是恆星乙的多少倍？ Link to post Share on other sites
Yu3 0 Posted June 23, 2016 Author Report Share Posted June 23, 2016 @黃卉妤 請問解題過程～ Link to post Share on other sites
黃卉妤 1 Posted June 23, 2016 Report Share Posted June 23, 2016 設所求距離為x 已知公式為B=L/4 π d2---(1) 而2B=8L/4π x2---(2) 從(1)推導2B=2L/4π d2=(2) 化簡移項即得所求x=2d 故甲之距離為乙的兩倍 1 Link to post Share on other sites
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