Examine the information.

Question

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

Answer 1

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.

Answer 2

25

Answer 3

right