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?

Answers

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?

Answer #1| 06/10 2015 01:5750 %