how do you solve half life problems? I'm so confused.?
2015-09-06 3:58 pm
How long does it take for 1.00 g of 103Pd to decay to 0.125 g if its half-life is 17.0 d?
回答 (2)
2015-09-06 4:11 pm
0.125 g = (1.00 g) × (1/2)³
Thus, it take 3 half-lives.
Time taken
= (17.0 days) × 3
= 51.0 days ...... (ans)
Thus, it take 3 half-lives.
Time taken
= (17.0 days) × 3
= 51.0 days ...... (ans)
2015-09-06 6:21 pm
The problem statement is
1.0g * 1 / 2^x = 0.125
1.0 g / 2^x = 0.125
0.125 * 2^x = 1.0; where x is number of half-lives.
2^x = 1.0 / 0.125 = 8
ln(2^x) = ln(8)
x * ln(2) = ln(8)
x * 0.69315 = 2.07994
x = 3
1.0g * 1 / 2^x = 0.125
1.0 g / 2^x = 0.125
0.125 * 2^x = 1.0; where x is number of half-lives.
2^x = 1.0 / 0.125 = 8
ln(2^x) = ln(8)
x * ln(2) = ln(8)
x * 0.69315 = 2.07994
x = 3
收錄日期: 2021-04-18 00:11:14
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