molybdenum_99(mo-90)has a half life of 66 hours?
molybdenum_99(mo-90)has a half life of 66 hours. after 132 hours,how much of an initial sample of 10 ci of mo-99 would remain?.
a 10 ci
b 5ci
c
2.5ci
d
1.25ci
Samsung Plasma TV
a 10 ci
b 5ci
c
2.5ci
d
1.25ci
Samsung Plasma TV
This entry was posted on Saturday, September 13th, 2008 at 5:20 pm and is filed under Mathematics. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.
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September 15th, 2008 at 1:08 pm
132 hours is two groups of 66 hours, which means that two half-lives have passed. That means a quarter of the same remains. A quarter of 10 ci is 2.5 ci.
Answer choice C.
-John
September 15th, 2008 at 6:17 pm
The answer is C: 2.5 ci. After 66 hours, the 10 ci sample would halve, becoming 5 ci. After another 66 hours (totaling 132 hours) the sample would halve again and become 2.5 ci.