If 232Th (half-life 1.4 × 1010 years) and 238U (half-life 4.5 × 109years) were present in equal amounts when the earth was formed, calculate their relative abundance at present. Note: The age of the earth is 4.54 billion years. NTh(t)/NU(t)= ?

If 232Th (half-life 1.4 × 1010 years) and 238U (half-life 4.5 × 109years) were present in equal amounts when the earth was formed, calculate their relative abundance at present. Note: The age of the earth is 4.54 billion years. NTh(t)/NU(t)= ?

Modern Physics

3rd Edition

ISBN:9781111794378

Author:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Publisher:Raymond A. Serway, Clement J. Moses, Curt A. Moyer

Chapter13: Nuclear Structure

Section: Chapter Questions

Problem 13Q

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Question

If ²³²Th (half-life 1.4 × 10¹⁰ years) and 238U (half-life 4.5 × 10⁹years) were
present in equal amounts when the earth was formed, calculate their relative abundance at
present. Note: The age of the earth is 4.54 billion years.

N_Th(t)/N_U(t)= ?

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