B5. A living tree has a carbon-14 decay rate of 13.6 counts per minute per gram. An old dried piece of wood from the same type of tree has a decay rate of 3.4 counts per minute per gram. (a) Estimate the age of the old piece of wood. The half life of carbon-14 is 5730 years. (b) How many counts per minute per gram will be measured if the wood was 18,000 years old? Express the values to 3 significant figures, if necessary.

B5. A living tree has a carbon-14 decay rate of 13.6 counts per minute per gram. An old dried piece of wood from the same type of tree has a decay rate of 3.4 counts per minute per gram. (a) Estimate the age of the old piece of wood. The half life of carbon-14 is 5730 years. (b) How many counts per minute per gram will be measured if the wood was 18,000 years old? Express the values to 3 significant figures, if necessary.