Author Question: The Rb-87/Sr-87 method of dating rocks is often used by geologists: t1/2 = 6.0 1010 yrEstimate ... (Read 34 times)

hgjjghgjh · **on:** Nov 5, 2023

Question 1

The radioisotope potassium-40 decays to argon-40 by positron emission with a half-life of 1.3 × 10⁹ yr. A sample of moon rock was found to contain 78 argon-40 atoms for every 22 potassium-40 atoms. The age of the rock is
◦ 8.1 × 10^–10 yr
◦ 2.4 × 10⁹ yr
◦ 2.8 × 10⁹ yr
◦ 4.6 × 10⁹ yr
◦ 6.8 × 10⁹ yr

Question 2

The Rb-87/Sr-87 method of dating rocks is often used by geologists:

t_1/2 = 6.0 × 10¹⁰yr
Estimate the age of a rock sample in which the present-day mole ratio of Rb-87 to Sr-87 is 36:1.
◦ 2.4 × 10⁹ yr
◦ 1.7 × 10⁹ yr
◦ 3.1 × 10¹¹ yr
◦ 4.1 × 10^–11 yr
◦ 3.6 × 10¹¹ yr

reason44 · **Reply #1 on:** Nov 5, 2023

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