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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