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The half life of Pa-234 is 6.75 hr. How much (what fraction) of a sample of this isotope remains after 20.25 hr?

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  • The half life of Pa-234 is 6.75 hr. How much (what fraction) of a sample of this isotope remains after 20.25 hr?


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Answer #1 | 06/10 2015 01:57
(1/2)^(20.25/6.75) (1/2)^3 1/8 <----
Positive: 50 %
Answer #2 | 06/10 2015 01:47
So in one hour half the amount remains (that's what half life means). In two hours 1/4 (or half of half) would remain and in three hours 1/8 would remain. Now can you translate 1/8 into a fraction?
Positive: 50 %
Anonymous812659 | 17/08 2017 18:41
1/8
Positive: 50 %
Answer #4 | 05/10 2015 18:57
(1/2)^(20.25/6.75) (1/2)^3 1/8 <----
Positive: 50 %
Answer #5 | 05/10 2015 18:47
So in one hour half the amount remains (that's what half life means). In two hours 1/4 (or half of half) would remain and in three hours 1/8 would remain. Now can you translate 1/8 into a fraction?
Positive: 50 %

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