# Worksheet: Radiometric Dating

In this worksheet, we will practice using isotope ratios to estimate sample age and comparing the advantages and limitations of radiometric dating methods.

**Q2: **

Carbon-14 decays to nitrogen-14 with a half-life of 5,730 years. A piece of paper from the Dead Sea Scrolls has an activity of 10.8 decays per minute per gram of carbon. If the initial activity was 13.6 decays per minute per gram of carbon, estimate, to three significant figures, the age of the Dead Sea Scrolls.

- A years
- B years
- C years
- D years
- E years

**Q3: **

Carbon-14 decays to nitrogen-14 with a half-life of 5,730 years. A sample of plant material from an ancient Egyptian tomb has an activity of 9.07 decays per minute per gram of carbon. If the initial activity was 13.6 decays per minute per gram of carbon, estimate the age of the tomb to three significant figures.

- A years
- B years
- C years
- D years
- E years

**Q9: **

The decay of produces . The quantities of and in a meteorite suggest an age of 15 million years. However, other radiometric dating methods suggest the meteorite is 10 million years old. Which of the following is a possible explanation for this discrepancy?

- AThe half-life of in the meteorite is shorter than expected.
- BSome was already present when the meteorite formed.
- CAdditional is formed by another decay process.
- DSome of the has further decayed.
- ESome of the gaseous has escaped the meteorite.