Answered

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Ac-225 has a half-life of 10 days. A sample has been on a shelf for a month. About how much of the sample is still radioactive?

Sagot :

Answer:

1/8th of the original amount

Explanation:

One month (30 days) is 3 half lives

so 1/2 * 1/2 * 1/2 = 1/8 th is left radioactive

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