Question

How much of a sample remains after five half-lives have occurred?

1/5 of the original sample
1/25 of the original sample
1/32 of the original gample
1/64 of the original sample

Answer 1

1/32

Step-by-step explanation:

Answer 2

The answer is 1/32

The first half-life, we have 1 • 1/2 = 1/2 left.
After two: 1/2 • 1/2 = 1/4
Three: 1/4 • 1/2 = 1/8
Four: 1/8 • 1/2 = 1/16
And five: 1/16 • 1/2 = 1/32.