The half-life of iodine-131 is approx. 8 day. How much of an original sample will be left after 24 days?
- I dont get how to answer it theres no measurments being used!?
2007-10-20 17:07:24 · 6 answers · asked by siimpli_mi 2 in Science & Mathematics ➔ Chemistry
1/8
1/2 8 days
1/4 16 days
1/8 24 days
i assume
2007-10-20 17:14:14 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Ah, but there is. You use the half-life concept to come up with the answer. So if half is gone in 8 days, 3/4 is gone after a total 16 days and so on. Your book should have a formula for other time-frames.
2007-10-21 00:31:44 · answer #2 · answered by cattbarf 7 · 0⤊ 0⤋
if a half life is 8 days, then there will be 50% left after 8 days. after 12 days there will be 50% of 50 (which is 25%) then after 18 days 50% of 25 (which is 12.5%) and after 24 days 50% of 12.5 (6.25%)
2007-10-21 00:13:37 · answer #3 · answered by Alex S 2 · 0⤊ 0⤋
1/8 of the original sample...
2007-10-21 00:13:19 · answer #4 · answered by Anonymous · 0⤊ 0⤋
every 8 days, you have lost half your sample
after 8 days, 50% remains
after 16 days, 25% remains
after 24 days, 12.5% remains
2007-10-21 00:15:27 · answer #5 · answered by ChemistryMom 5 · 0⤊ 0⤋
16.375
2007-10-21 00:37:18 · answer #6 · answered by Melzy 2 · 0⤊ 0⤋