Question

The half-life of tritium, or hydrogen-3, is 12.32 years. After about 24.6 years, how much of a sample of tritium will remain unchanged?

A. 1/8

B. 1/4

C. 1/3

D. 1/2

Answer 1

How many half-lives have passed after 24.6 years?

Answer 2

I'm not sure..

Answer 3

whats the half-life?

Answer 4

12.32

Answer 5

okay, so if 24.6 years have passed, how many times have 12.32 years passed?

Answer 6

303.072

Answer 7

what, think about this. How is that possible.

Suppose that the half-life of A is 2 years. If 6 years have passed, how many half-lives have passed? In other words, how many times has the span of 2 years passed in 6 years?

Answer 8

3

Answer 9

YES. okay, back to the original question.

if 24.6 years pass, how many times have 12.32 years passed?

Answer 10

Almost 2

Answer 11

Can rule D out

Answer 12

No, D is the closest to the right answer

Answer 13

I'm still confused :/

Answer 14

nope, D is not the right answer.

Every time a half-life passes, 50% of the material you have decays (is lost).