164k views
2 votes
If 0.78% of a radioactive substance remains, then how many half-lives have passed?

3

7

6

4

2 Answers

3 votes

Answer:

7

Step-by-step explanation:

Just took the quiz on k12.

Nuclear Chemistry

User Ivankeller
by
9.0k points
6 votes
The answer would be 7 because of this solution:

You divide (1|2) and then divide it by 7.

The answer should be 0.78% of the remaining half-lives after 7. Because of the remaining radioactive substance that happens during that 0.78 percentage.
User Jacktose
by
7.7k points

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