- #1

Natalie

**[SOLVED] Half Life**

I can't get the answer to this question.

If Hydrogen 3 ( 3H )

( 1 )

has a half life of 12.5a, how many years have passed when only 1/64 of its original mass remains?

- Thread starter Natalie
- Start date

- #1

Natalie

I can't get the answer to this question.

If Hydrogen 3 ( 3H )

( 1 )

has a half life of 12.5a, how many years have passed when only 1/64 of its original mass remains?

- #2

russ_watters

Mentor

- 19,861

- 6,286

Half life is a pretty simple thing, you can count this one on your fingers. 1 half life is 1/2, 2 half lives is 1/4, 3 is 1/8, 4 is 1/16, 5 is 1/32, and 6 is 1/64.

But I don't know what "12.5a" means.

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