Absolute Dating

Homework #2 – Absolute Dating
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Using the following data to complete the problems below:

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Dating System radioactive decay of Age of half-life
238U →206Pb Uranium-238 to Lead-206 4.5 billion years
235U →207Pb Uranium-235 to Lead-207 713 million years
40K → 40Ar Potassium-40 to Argon-40 1.3 billion years
14C → 14N Carbon-14 to Nitrogen-14 5,730 years

1. A rock originally had 1500 atoms of 235U parent isotope and it now has 750 atoms left. How old is it?

2. A rock originally had 4800 atoms of 40K parent isotope and no 40Ar daughter isotope. It now has 400 atoms of 40K parent isotope left. Assuming that the only chemical process is the radioactive decay of potassium to argon, what is the age of the rock?

a) 1.576 billion years
b) 1.375 billion years
c) 2.643 billion years
d) 4.660 billion years
e) 5.303 billion years

How many atoms of 40Ar daughter isotope are there in the rock now? ___________

3. A rock originally has 2200 atoms of 235U parent isotope and no 207Pb daughter isotope. It now has 800 atoms of 235U parent isotope left. Assuming the only chemical process is the radioactive decay of uranium to lead, what is the age of the rock?

a) 1745 million years
b) 1375 million years
c) 2643 million years
d) 2032 million years
e) 713 million years

How many atoms of 207Pb daughter isotope are there in the rock now? _____For more information on Absolute Dating visit this: https://en.wikipedia.org/wiki/Absolute_dating

Absolute Dating

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