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What is the half life of each of these radioactive isotopes? a radioactive isotope decreased to one-fourth its original amount in 18 months.

What is the half life of each of these radioactive isotopes? a radioactive isotope decreased to one-fourth its original amount in 18 months.
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What is the half life of each of these radioactive isotopes?

a radioactive isotope decreased to one-fourth its original amount in 18 months.

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User Caryl
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The half life would be 9 months long.
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User Nick Banks
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One fourth means (one half) of (one half) .

So the 18 months must be two half-lifes.

The half-life of this particular isotope is 9 months.
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User Wibberding
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