(a) 2. Rhenium-187 is a radioactive isotope that can be used to determine the age of meteorites. A
0.100 mg sample of Rhenium, Re contains 2.02 x 10' atoms of "Re. What is the percent
abundance of rhenium-187 in the sample?

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i think is conclusions.i think so

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.

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