Question

PLEASE HELP ASAP

(50 POINTS)

You have 400,000 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.

Answer 1

If 2 half-lives have passed, it means that the radioactive substance has decayed twice, so the number of remaining atoms would be:

1st half-life: 400,000 / 2 = 200,000 atoms remaining

2nd half-life: 200,000 / 2 = 100,000 atoms remaining

Therefore, after 2 half-lives have passed, 100,000 atoms would remain, rounded to the nearest whole number

Step-by-step explanation:

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