COLLEGE PHYSICS LL W/ 6 MONTH ACCESS
2nd Edition
ISBN: 9781319414597
Author: Freedman
Publisher: MAC HIGHER
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Chapter 27, Problem 13QAP
To determine
That at any given instant a sample of radioactive uranium contains many, many different isotopes of atoms that are not uranium.
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Students have asked these similar questions
•49 SSM Generally, more massive nuclides tend to be more un-
stable to alpha decay. For example, the most stable isotope of ura-
nium, 28U, has an alpha decay half-life of 4.5 x 10° y. The most stable
isotope of plutonium is 24Pu with an 8.0 x 10' y half-life, and for
curium we have 248Cm and 3.4 x 10 y. When half of an original sam-
ple of 238U has decayed, what fraction of the original sample of (a) plu-
tonium and (b) curium is left?
•61 The isotope 238SU decays to 206 Pb with a half-life of 4.47 x 10°
y. Although the decay occurs in many individual steps, the first step
has by far the longest half-life; therefore, one can often consider
the decay to go directly to lead. That is,
238U → 206Pb + various decay products.
A rock is found to contain 4.20 mg of 23$U and 2.135 mg of 206PB.
Assume that the rock contained no lead at formation, so all the
lead now present arose from the decay of uranium. How many
atoms of (a) 238U and (b) 206Pb does the rock now contain? (c) How
many atoms of 238U did the rock contain at formation? (d) What is
the age of the rock?
•3 @ A thermal neutron (with approximately zero kinetic energy) is
absorbed by a 23U nucleus. How much energy is transferred from
mass energy to the resulting oscillation of the nucleus? Here are some
atomic masses and the neutron mass.
237U 237.048 723 u
239U 239.054 287 u
238U 238.050 782 u
240U 240.056 585 u
1.008 664 u
Chapter 27 Solutions
COLLEGE PHYSICS LL W/ 6 MONTH ACCESS
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