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As a sample of the radioactive isotope 131I decays, its half-life(1) decreases(2) increases(3) remains the same

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Half life is a constant, meaning that it will never change, so the answer is (3)

Answer : The correct option is, (3) remains the same.

Explanation:

Half life : It is defined as the amount of time taken by a radioactive material to decay to half of its original value.

All radioactive decays follow first order kinetics.

The relation between the half-life and rate constant is:

[tex]k=\frac{0.693}{t_{1/2}}[/tex]

The half-life of the radioactive isotope is remains the same that means a constant  value and it is not affected by any external conditions.

Thus, the half-life remains the same as a sample of the radioactive isotope decays.

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