It takes 10.0 days for 42.1% of a sample of barium-140 to decay.What is the half-life of 140Ba, and what is the decay rate constant in s-1?

Name: It takes 10.0 days for 42.1% of a sample of barium-140 to decay.What is the half-life of 140Ba, and what is the decay rate constant in s-1?
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The Answer of It takes 10.0 days for 42.1% of a sample of barium-140 to decay.What is the half-life of 140Ba, and what is the decay rate constant in s-1?

It Takes 10