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?66PE from the appendices and the periodic table may be
Chapter 31, Problem 66(choose chapter or problem)
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?
Questions & Answers
QUESTION:
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?
ANSWER: