(Answered) A sample of a certain radioactive material decays to 8936

Engineering

A sample of a certain radioactive material decays to 89.36% of its mass after 2 years.

a. What is the half-life of the material? show your calculations and keep four significant figures of accuracy.

b. How long would it take for the sample to decay to 10% of its original mass? How much longer after that would it take to decay to 1% of its original mass?

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