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A radioactive sample is 555 years old. It’s half life is 111 years. How many half lives?
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A radioactive sample is 555 years old. It’s half life is 111 years. How many half lives?

User George Udosen
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1 Answer

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Given: Age of sample = 555
Half life = 111

So, number of half life =
\frac{\text{Age of sample}}{\text{half life}}
=
(555)/(111)
= 5

Thus, number of half life of radioactive sample is 5
User Juhanic
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