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› PHYSICS: light intensity題目一問
emanuele_lee
發表於 2008-1-12 15:59
PHYSICS: light intensity題目一問
小弟有一題關於light intensity的題目想向各位請教
題目:The intensity of a light source, L1, is 200 cd measured at a distance, d1, of 1.5m from the source. Find the intensity, L2, if hte distance, d2, is doubled.
thx.
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PHYSICS: light intensity題目一問