Question

URGENT!!! 30 POINTS!!!!

1. We start with 400 atoms of Uranium-238. How many remain after 4.5 billion years? _______ After 9 billion years? _______ After 13.5 billion years? ________

2 . How long will it take for ½ of the original amount of Rubidium-87 to decay? _______

3. Carbon-14 has a half-life of 5,730 years. How does that compare to those listed in the chart?


What possible advantages or disadvantages would this give C-14 when used for radiometric dating?

Answer 1

1. After 4.5 billion years- 200 atoms.
After 9 billion years- 100 atoms.
After 13.5 billion years- 50 atoms.

3. Carbon-14 has a much shorter half life than the elements listed in the chart, therefore it would decay much quicker.