Problem: A sample of Th-219 requires 3.84x10 –6 seconds to decay to 1.50 mg. What was the initial mass of the sample? The half-life for Th-219 is 1.05x10 –6 seconds. A. 3.0mg B. 5.9mg C. 18.9mg D. 37.8mg E. 56.1mg 

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Problem Details

A sample of Th-219 requires 3.84x10 –6 seconds to decay to 1.50 mg. What was the initial mass of the sample? The half-life for Th-219 is 1.05x10 –6 seconds.

A. 3.0mg

B. 5.9mg

C. 18.9mg

D. 37.8mg

E. 56.1mg 

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