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Chapter 42: Nuclear Physics

Fundamentals Of Physics
Pages: 1276 - 1308

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110 Questions for Chapter 42: Nuclear Physics

  1. What is the mass excess ∆1of1H(actual mass is 1.007825 u) in (a) atomic mass units and (b) MeV/c2? What is the mass excess ∆nof a neutron (actual mass is 1.008665u ) in (c) atomic mass units and (d) MeV/c2? What is the mass excess ∆120of120Sn(actual mass is119.902197 u) in (e) atomic mass units and (f) MeV/c2?

    Found on Page 1302
  2. Figure 42-17 shows the curve for the binding energy per nucleon∆Ebenversus mass number A. Three isotopes are indicated. Rank them according to the energy required to remove a nucleon from the isotope, greatest first.

    Found on Page 1302
  3. Nuclear radii may be measured by scattering high energy (high speed) electrons from nuclei. (a) What is the de-Broglie wavelength for 200MeV electrons? (b) Are these electrons suitable probes for this purpose?

    Found on Page 1302
  4. At, t = 0a sample of radionuclide Ahas twice the decay rate as a sample of radionuclide B.The disintegration constants are λAandλBwithλA>λB. Will the two samples ever have (simultaneously) the same decay rate?

    Found on Page 1302
  5. The electric potential energy of a uniform sphere of charge qand radius ris given by U=3q220πε0r(a) Does the energy represents a tendency for the sphere to bind together or blow apart? The nuclide 239Pu is spherical with radius 6.64fm . For this nuclide, what are (b) the electric potential energy Uaccording to the equation, (c) the electric potential energy per proton, and (d) the electric potential energy per nucleon? The binding energy per nucleon is 7.56MeV. (e) Why is the nuclide bound so well when the answers to (c) and (d) are large and positive?

    Found on Page 1302
  6. Figure 42-18 is a plot of mass number Aversus charge number Z.The location of a certain nucleus is represented by a dot. Which of the arrows extending from the dot would best represent the transition were the nucleus to undergo (a) aβdecay and (b) aαdecay?

    Found on Page 1302
  7. A neutron star is a stellar object whose density is about that of nuclear matter,2×1017kg/m3 . Suppose that the Sun were to collapse and become such a star without losing any of its present mass. What would be its radius?

    Found on Page 1303
  8. (a) Which of the following nuclides are magic:122Sn,132Sn,198AU,208pb? (b) Which, if any, are doubly magic?

    Found on Page 1302
  9. What is the binding energy per nucleon of the americium isotope Am95244? Here are some atomic masses and the neutron mass.

    Found on Page 1303
  10. If the mass of a radioactive sample is doubled, do (a) the activity of the sample and (b) the disintegration constant of the sample increase, decrease, or remain the same?

    Found on Page 1302

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