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You have 500,000 atoms of a radioactive substance. After 2 half-lives have past, how many atoms remain?

Remember that you cannot have a fraction of an atom, so round the answer to the nearest whole number.

Your Answer:

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azza2405

Answer:

125000

Explanation:

Because it is halved and halved again.

subbhy
Half life - when half of the radioactive substance has become stable

500,000/2 = 250,000 remaining after the first half life

250,000/2 = 125,000 remaining after the second


Or alternatively 1/4 x 500,000 = 125,000

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