It takes 18.0 days for 62.4% of a sample of barium-140 to decay.What is the half-life of ¹⁴⁰Ba,and what is the decay rate constant?

Name: It takes 18.0 days for 62.4% of a sample of barium-140 to decay.What is the half-life of 140 Ba,and what is the decay rate constant?
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The Answer of It takes 18.0 days for 62.4% of a sample of barium-140 to decay.What is the half-life of ¹⁴⁰Ba,and what is the decay rate constant?

It Takes 18