A bacteria culture doubles in size in 8 hours. Explain how long will it take for the size to triple? Presume that the rate of increase of the culture is proportional to the size.
A fossilized tree is found. It contains 2% of the carbon-14 found in living matter. Explain what is the age of the tree? Presume that the c-14 decays at a rate proportional to the amount present. The half life of c-14 is 5600 years.