Radioactive Half-life Years Element A Remaining Radioactive Atoms Element B Remaining Radioactive Atoms Element C Remaining Radioactive Atoms Element D remaining Radioactive Atoms 0 100 100 100 100 1000 50 85 90 95 2000 25 72 81 90 3000 13 61 73 86 4000 6 52 66 81 5000 3 44 59 77 6000 2 38 53 74 7000 1 32 48 70 8000 0 27 43 66 9000 0 23 39 63 10000 0 20 35 60 11000 0 17 31 57 12000 0 14 28 54 13000 0 12 25 51 14000 0 10 23 49 15000 0 9 21 46 16000 0 7 19 44 17000 0 6 17 42 18000 0 5 15 40 19000 0 5 14 38 20000 0 4 12 36 Question: According to your data, what are the approximate half-lives of the hypothetical elements A, B, C, and D? Note: The Professor gave more directions: The first question asks for the half-lives of each of the elements. You don't have to use a formula to find. Look at the data in the table and guessimate. For example if the the number 50 isn't shown but has 52 at 7000 years and 47 at 8000 years, then you could say the half live is around or approximately 7500 years. The answer shouldn't be 7000 because haven't yet reached 50 of parent remaining at that point just as it shouldn't be 8000 because have less than 50 of parent present.
Radioactive Half-life
|
Years |
Element A Remaining Radioactive Atoms |
Element B Remaining Radioactive Atoms |
Element C Remaining Radioactive Atoms |
Element D remaining Radioactive Atoms |
|
0 |
100 |
100 |
100 |
100 |
|
1000 |
50 |
85 |
90 |
95 |
|
2000 |
25 |
72 |
81 |
90 |
|
3000 |
13 |
61 |
73 |
86 |
|
4000 |
6 |
52 |
66 |
81 |
|
5000 |
3 |
44 |
59 |
77 |
|
6000 |
2 |
38 |
53 |
74 |
|
7000 |
1 |
32 |
48 |
70 |
|
8000 |
0 |
27 |
43 |
66 |
|
9000 |
0 |
23 |
39 |
63 |
|
10000 |
0 |
20 |
35 |
60 |
|
11000 |
0 |
17 |
31 |
57 |
|
12000 |
0 |
14 |
28 |
54 |
|
13000 |
0 |
12 |
25 |
51 |
|
14000 |
0 |
10 |
23 |
49 |
|
15000 |
0 |
9 |
21 |
46 |
|
16000 |
0 |
7 |
19 |
44 |
|
17000 |
0 |
6 |
17 |
42 |
|
18000 |
0 |
5 |
15 |
40 |
|
19000 |
0 |
5 |
14 |
38 |
|
20000 |
0 |
4 |
12 |
36 |
Question: According to your data, what are the approximate half-lives of the hypothetical elements A, B, C, and D?
Note: The Professor gave more directions: The first question asks for the half-lives of each of the elements. You don't have to use a formula to find. Look at the data in the table and guessimate. For example if the the number 50 isn't shown but has 52 at 7000 years and 47 at 8000 years, then you could say the half live is around or approximately 7500 years. The answer shouldn't be 7000 because haven't yet reached 50 of parent remaining at that point just as it shouldn't be 8000 because have less than 50 of parent present.
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