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College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000

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BuyFindarrow_forward

College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
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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