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The Los Angeles County Police want to use neutronactivation analysis to look for a tiny

Modern Physics for Scientists and Engineers | 4th Edition | ISBN: 9781133103721 | Authors: Stephen T. Thornton, Andrew Rex ISBN: 9781133103721 454

Solution for problem 48 Chapter 13

Modern Physics for Scientists and Engineers | 4th Edition

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Modern Physics for Scientists and Engineers | 4th Edition | ISBN: 9781133103721 | Authors: Stephen T. Thornton, Andrew Rex

Modern Physics for Scientists and Engineers | 4th Edition

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Problem 48

The Los Angeles County Police want to use neutronactivation analysis to look for a tiny residue of bariumin gunpowder. The suspected residue is placed in anuclear reactor, where it is activated by the neutronfl ux. Natural barium contains 71.7% 138Ba. The emitter 139Ba is produced in the 138Ba(n, )139Ba reaction.The half-life of 139Ba is 83.1 min. 139Ba beta decaysto 139La, 72% going to the ground state and 27%going to the fi rst excited state at 0.166 MeV. Scientiststhink they need a count rate for the 166-keV ray(decay to the ground state) of at least 1000 Bq 30 minafter the residue is removed from the reactor in orderto make a positive identifi cation of barium. (a) Howmany 139Ba nuclei must be present at the end of theactivation? (Remember the decay and fraction goingto the fi rst excited state.) (b) How many grams of 139Ba must be produced? If the original amount ofbarium was 0.01 g, what fraction of the 138Ba wasactivated?

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Some on test 2 notes GW1:block mass m1=10 at rest on rough horiz surface.Connected to hanging mass m2=15 by massless string across massless frictionless pulley.Speed of blocks after released and fallen d=1.5m if coeff btwn block 1 and surface is uk=0.5 Same question w angular speed of pulley Ex2) hoop w radius 0.5 and m=2.Rolls w/out slipping 1.5m down plane inclined at 30 deg above horiz.Speed of hoop at bottom Angular speed at bottom • KEtrans- if obj center of mass moving • KErot- if obj it rotating about its center of mass • Work done by constant force/torque. Usually cos180/0(+1,-1) • PEg-When height of center of mass moves (Peg=mgh) h in cm • Static eq- when all F=0(in x & y..Trans eq) andT=0 (torques) probs:

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Chapter 13, Problem 48 is Solved
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Textbook: Modern Physics for Scientists and Engineers
Edition: 4
Author: Stephen T. Thornton, Andrew Rex
ISBN: 9781133103721

The full step-by-step solution to problem: 48 from chapter: 13 was answered by , our top Physics solution expert on 03/16/18, 03:15PM. This textbook survival guide was created for the textbook: Modern Physics for Scientists and Engineers, edition: 4. Modern Physics for Scientists and Engineers was written by and is associated to the ISBN: 9781133103721. The answer to “The Los Angeles County Police want to use neutronactivation analysis to look for a tiny residue of bariumin gunpowder. The suspected residue is placed in anuclear reactor, where it is activated by the neutronfl ux. Natural barium contains 71.7% 138Ba. The emitter 139Ba is produced in the 138Ba(n, )139Ba reaction.The half-life of 139Ba is 83.1 min. 139Ba beta decaysto 139La, 72% going to the ground state and 27%going to the fi rst excited state at 0.166 MeV. Scientiststhink they need a count rate for the 166-keV ray(decay to the ground state) of at least 1000 Bq 30 minafter the residue is removed from the reactor in orderto make a positive identifi cation of barium. (a) Howmany 139Ba nuclei must be present at the end of theactivation? (Remember the decay and fraction goingto the fi rst excited state.) (b) How many grams of 139Ba must be produced? If the original amount ofbarium was 0.01 g, what fraction of the 138Ba wasactivated?” is broken down into a number of easy to follow steps, and 160 words. This full solution covers the following key subjects: . This expansive textbook survival guide covers 15 chapters, and 898 solutions. Since the solution to 48 from 13 chapter was answered, more than 229 students have viewed the full step-by-step answer.

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