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Get Full Access to College Physics - 1 Edition - Chapter 31 - Problem 66pe
Get Full Access to College Physics - 1 Edition - Chapter 31 - Problem 66pe

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# ?66PE from the appendices and the periodic table may be

ISBN: 9781938168000 42

## Solution for problem 66PE Chapter 31

College Physics | 1st Edition

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Problem 66PE

66PE

Problem

Data from the appendices and the periodic table may be needed for these problems.

Unreasonable Results A nuclear physicist finds 1.0 µg of 236 U in a piece of uranium ore and assumes it is primordial since its half-life is 2.3×107 y . (a) Calculate the amount of 236 U that would had to have been on Earth when it formed 4.5×109 y ago for 1.0 µg to be left today. (b) What is unreasonable about this result? (c) What assumption is responsible?

Step-by-Step Solution:
Step 1 of 3

Solution 66PE

1. initial mass of Uranium is 7.7 x 1049 kg
2. The initial mass of the Uranium is extremely large that seems unreasonable because that much mass is even greater than the entire Milky Way galaxy.
3. The assumed half life is very small and hence responsible for the unreasonable result. The half life of the U-236 must be larger than the assumed value.

Step 2 of 3

Step 3 of 3

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