Question

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

Answer 1

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

Answer 2

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

Step-by-step 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:

`k=(0.693)/(t_(1/2))`

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.