   Chapter 31, Problem 55PE

Chapter
Section
Textbook Problem

Data from the appendices and the periodic table may be needed for these problems.What fraction of the 40K mat was on Earth when it formed 4.5 × 10 9 years ago is left today?

To determine

To fraction of K40 left on Earth after 4.5×109 years.

Explanation

Given info:

• The time elapsed is 4.5×109years.
• The half-life of K40 is 1.28×109y .

Formula used:

Formula to find the left fraction is,

NiN=e0.693t 1 2×t

Here, Ni is the initial number of K40 , N is the present number of atom, t12 is the half-life of K40 and t is the time elapsed

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