23940. Balance the following equation: 93239,90Th239 U922390 Pu94238-9441. What is the half-life of an isotope if 31.3 g of a 500 g sample of the isotope remain after 16 years?4 years8 years5.3 years4.5 years42. According to the table below, if a rock contains 12.5 percent as much potassium-40 as rocks being formed today, how old is the rock?NuclideHalf-Life (years)carbon-14 5.71 x 10²potassium-40 1.26 x 10⁹radium-226 1.60 x 10²thorium-230 7.54 x 104uranium-235 7.04 x 108O2.36 x 10² years2.11 x 10⁹ years4.20 x 108 yearsO 3.78 x 10 years

Given data: N93239p → .....+ e-10 Required: Balance the equation

Answered: 40. Balance the following equation:…

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40. Balance the following equation: 239- Th 90 239 U 239 94 2381 94 Pu 239 93

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

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Concept explainers

Nuclear Reactions

Nuclear reactions are processes in which the fundamental characteristics of a nucleus changes. They change into a completely different nucleus. These processes occur naturally in an unstable nucleus. Bombarding an energetic particle can induce nuclear reactions. In this article, both the naturally occurring nuclear reactions are termed as radioactive decay and the induced nuclear reactions are further categorized as nuclear fission and nuclear fusion.

Question

239
40. Balance the following equation: 93
239,
90
Th
239 U
92
2390 Pu
94
238-
94
41. What is the half-life of an isotope if 31.3 g of a 500 g sample of the isotope remain after 16 years?
4 years
8 years
5.3 years
4.5 years
42. According to the table below, if a rock contains 12.5 percent as much potassium-40 as rocks being formed today, how old is the rock?
Nuclide
Half-Life (years)
carbon-14 5.71 x 10²
potassium-40 1.26 x 10⁹
radium-226 1.60 x 10²
thorium-230 7.54 x 104
uranium-235 7.04 x 108
O2.36 x 10² years
2.11 x 10⁹ years
4.20 x 108 years
O 3.78 x 10 years

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