OG11-紫91 (已搜索過，不明白題目意思)

Kath1985 · 发表于 2010-2-27 13:51:26

OG11-紫91
For a light that has an intensity of 60 candles at tis source, the intensity in candles, S, of the light at a point d feet from the source is given by the formula S=60k/d^2, where k is a constant. If the intensity of the light is 30 candles at a distance of 2 feet from the source, what is the intensity of the light at a distance of 20 feet from the source?
A 3/10 candle
B 1/2 candle
C 1 candle
D 2 candle
E 3 candle
答案為A

想請牛牛們幫我解釋題目意思感激~

kingapple25 · 发表于 2010-2-27 14:36:43

有一光源，亮度为60，距光源d处的亮度为S=60k/d^2, k是常数，如果在距这个光源2 feet处的亮度是30，那么距此光源20 feet处的亮度是多少？

Kath1985 · 发表于 2010-3-3 14:09:12

擱了三天多謝kingapple的解釋這會檢討才看懂

OG11-紫91 (已搜索過，不明白題目意思)

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