BähbëëÄšh BähbëëÄšh

14-01-2015
Physics

Answered

If We Start With 400 Atoms Of A Radioactive Substance, How Many Would Remain After Two Half-Lives?

Answer :

jsdye2010 jsdye2010

14-01-2015

You basically take a half-life one at a time. The first half-live gets rid of 200 of the atoms, leaving you with 200. Then the second half life gets rid of 100 of the remaining atoms (half of the 200) leaving you with 100 atoms

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14-01-2015

Two half-lives produce (1/2) x (1/2) = 1/4 of the decaying substance.

There would still be 400 atoms. But 300 would have thrown off
particles from their nucleuses, and only 100 would still be radioactive.

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