Half-Life practice 1 2 What is half-life?
Half-Life practice
1 Create a graph that represents how a radioactive element will decay.
2 What is half-life?
100 90
80
% of original mass remaining
70
60
50
40 30 20
4 Gold-198 has a half life of 2.7 days. Complete the table for an initial sample size of 200 grams.
10
0 1 2 3 4 5 6 7 8 9 10
3 Number of half-lives The half-life of Po-214 is 0.001 seconds. How much of a 10-gram sample is left after 0.003 seconds?
Time Elapsed
0 days 2.7 days
Amount Remaining
200 grams
5 The graph below shows the breakdown of radon-222. 6 How much of a 500g sample of potassium-42 is left after
37.2 hours if the half-life of potassium-42 is 12.4 hours.
7
How much of a 100 gram sample of gold-198 is left after 8.10 days if its half life is 2.7 days?
What is the half-life of Rn-222? ________ What fraction of the original sample will be left after 3 half-lives?____
?The Trendy Science Teacher 2020
8
Time (days)
The table below shows the radioactive decay of a 600 g sample of iodine-125.
Half-lives
% of Parent Isotope Fraction of Parent Mass (g) of Parent
Remaining
Isotope Remaining
Isotope
0
0
100%
1/1
600
60
1
50%
?
300
120
2
25%
?
150
180
3
12.5%
1/8
75
240
4
6.25%
1/16
37.5
300
5
3.125%
1/32
18.75
360
6
1.56%
1/64
9.4
a. What percent of iodine is left after 5 half lives have passed? b. What percent of iodine-125 has decayed if there are 37.5 grams of the original sample left? c. What is the half life of iodine-125? d. What mass of the iodine-125 has decayed after 6 half-lives? e. What fraction of the iodine-125 remains after 300 days have passed? f. How many half lives would have to pass for there to be only 1.2 grams remaining?
9 Create your own half life problem in the space provided below. Then solve.
?The Trendy Science Teacher 2020
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