What is the half-life of K-44?
A. 11 minutes
B. 22 minutes
C. 44 minutes
D. 66 minutes
2006-12-12 04:23:19 · 7 answers · asked by Ashley C 1 in Science & Mathematics ➔ Chemistry
22 minutes
The half-life of a quantity subject to exponential decay is the time required for the quantity to decay to half of its initial value.
2006-12-12 04:25:38 · answer #1 · answered by DanE 7 · 0⤊ 0⤋
The half life is the time taken to decay to 50% of the original amount.
Thus in 1 half life, amount decreases to 50%
In 2 half lives, amount decreases to 50% of 50%, i.e. 25%
Therefore, 44 minutes represents 2 half-lives
So 1 half-life is 22 minutes
Answer B
2006-12-12 04:26:12 · answer #2 · answered by claudeaf 3 · 0⤊ 0⤋
Half-life means the time it takes for half the material to decay.
So after one half-life, 50% original remains.
After two half-lives, 50% of 50% remains = 0.5 X 0.5 = 0.25 =25%
Therefore, 44 minutes must be equal to 2 half-lives: B. is correct
2006-12-12 04:45:28 · answer #3 · answered by Jerry P 6 · 0⤊ 0⤋
None of the answers are correct.The 1/2 life is not a rate, but a constantly diminishing rate.
2006-12-12 04:40:13 · answer #4 · answered by Anonymous · 0⤊ 0⤋
it is easy ....
want the clue:???
remember:
100%--t1/2--->50%---t1/2--->25%.
hence in ur problem.
it is given to be 2t1/2=44minutes.
therefore,t1/2=22 minutes..
getting the answer now?
2006-12-12 04:30:53 · answer #5 · answered by physics 2 · 0⤊ 0⤋
b
2006-12-12 04:25:00 · answer #6 · answered by David B 6 · 0⤊ 0⤋
B....
2006-12-12 04:25:41 · answer #7 · answered by Anonymous · 0⤊ 0⤋