Posted by april on Saturday, January 31, 2009 at 12:14pm.
I should tell you that the opening statement is wrong. The other 98% percent is infrared (heat) radiation. There is almost no ultraviolet produced. The so called "typical" incandescent light bulbs are no longer in the majority, either.
As far as the questions go, for #1, multiply watts by the number of seconds to get energy produced (in Joules). For #2, (heat only) take 98% of 100 W.
c. Use common sense for #3. Or reread the first sentence of the question.
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