The equation of radioactive decay

The half-life of Molybdenum-93 is 4000 years. A sample of Molybdenum-93 has a mass of 10 mg. When will the mass be reduced to 1 mg?

Image Source: Virtual museum of chemical elements.

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A mixture of two radioactive elements

PIA17841A mixture contains two radioactive elements with half lives of 800 and 1600 years respectively. If the relative proportion of radioactive elements is initially 1:1, what is their relative proportion after 1600 years?

Image credit: NASA/JPL-Caltech/CXC/SAO/ Radioactive Core of a Dead Star

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