11 June, 09:13
The half-life of radon-222 is 3.8 days. If a sample currently contains 3.1 grams of radon-222, how much radon-222 did this sample have 15.2 days ago?
a 12.4 grams
b 47.1 grams
c 49.6 grams
d 57.8 grams
11 June, 10:45
The number of grams of radon 222 did it have 15.2 ago was 49.6 grams (answer C)
calculate the number of half life it has covered from 15.2 days to 3.8 days
that is divide 15.2 / 3.8 = 4 half life
half life is time taken for a radio activity of a specified isotope to fall to half its original mass
therefore 3.8 days ago it was 3.1 x2 = 6.2 grams
7.6 days ago it was 6.2 x2 = 12.4 grams
11.4 days ago it was 12.4 x2 = 24.8 grams
15.2 days ago it was 24.8 x2=49.6 grams
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» The half-life of radon-222 is 3.8 days. If a sample currently contains 3.1 grams of radon-222, how much radon-222 did this sample have 15.2 days ago? a 12.4 grams b 47.1 grams c 49.6 grams d 57.8 grams