Question
Examine the information.
Isotope B has a half-life of 3 days. A scientist measures out 100 grams of this substance. After 6 days has passed, the scientist reexamines the sample.
How much of Isotope B will remain in the sample?
100 grams
63 grams
94 grams
25 grams
Isotope B has a half-life of 3 days. A scientist measures out 100 grams of this substance. After 6 days has passed, the scientist reexamines the sample.
How much of Isotope B will remain in the sample?
100 grams
63 grams
94 grams
25 grams
Answers
The half life is 3 days. You start with 100 g. So at the end of 3 days, 1/2 of it is gone and you're left with 50 g.
At the end of another 3 days, another half is gone. What's left.
At the end of another 3 days, another half is gone. What's left.
25
right
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