Closest to the exact value

Reference no: EM13850509

2b. Assume you have a sample of atoms with a half-life of 0.5 second. Approximately how much (in %) of the original sample will be around after 3.5 seconds? * Choose the answer closest to the exact value.

0.1%
0.3%
1%
3%
10%
30%
100%

2c. Potassium-40 decays to Argon-40 with a half-life of 1.25 billion years old. If at the formation of the Earth we had 100% Potassium-40 and 0% Argon-40, what should be ratio of Potassium-40 / Argon-40 on the Earth today? * choose closest answer

0.05
0.09
.40
0.91
1.1
2.5
3.6
11.5
20
100

Reference no: EM13850509

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