Answered: You wanted to determine the age of…

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Question

You wanted to determine the age of zircons that fell on Earth as meteorites. You wanted to use the ²³⁸U-²⁰⁶Pb method (half-life value = 4.5 billion years). The lab results showed 25% ²³⁸U and 75% ²⁰⁶Pb. Which of the following conclusions can you make about the age of zircons and the reliability of the technique?

Select from the following and explain.

A. The age of the zircons is 1.5 billion years, nearly 1/3 that of our planet’s. These zircons must have come from a different planet within our solar system.

B. The lab results are not reliable because it is impossible to get 25% of the parent, 238U and 75% of the daughter, 206Pb.

C. The ages of the zircons represent that of our Earth’s (4.5 billion years) and must have come from within our solar system.

D. The results are not reliable because 238U and 75% 206Pb is not the best method to determine ages of zircons.

E. The zircons, having ages twice as much as our planet’s, must have come from outside of our solar system.

Expert Solution

Step 1: Determine the given data:

$25 percent sign space straight U minus 238 space and space 75 percent sign space Pb minus 206 space straight T subscript 1 divided by 2 end subscript equals 4.5 space billion space years$

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