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Chapter 40: All About Atoms

Fundamentals Of Physics
Pages: 1219 - 1251

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92 Questions for Chapter 40: All About Atoms

  1. An electron is in a state with n = 3. What are (a) the number of possible values of I, (b) the number of possible values of m1, (c) the number of possible values of ms, (d) the number of states in the n = 3 shell, and (e) the number of sub-shells in the n = 3shell?

    Found on Page 1247
  2. Consider the elements krypton and Rubidium.

    Found on Page 1246
  3. If orbital angular momentum is measured along, say, a z-axis to obtain a value for Lz, show thatrole="math" localid="1661497092782" (Lx2+Ly2)1/2=[I(I+1)-mI2]1/2ħ is the most that can be said about the other two components of the orbital angular momentum.

    Found on Page 1247
  4. On which quantum numbers does the energy of an electron depend in (a) a hydrogen atom and

    Found on Page 1246
  5. A magnetic field is applied to a freely floating uniform iron sphere with a radius R = 2.0 mm. The sphere initially had no net magnetic moment, but the field aligns 12% of the magnetic moments of the atoms (that is, 12% of the magnetic moments of the loosely bound electrons in the sphere, with one such electron per atom). The magnetic moment of those aligned electrons is the sphere’s intrinsic magnetic moment μ→s. What is the sphere’s resulting angular speed ?

    Found on Page 1247
  6. Which (if any) of the following are essential for laser action to occur between two energy levels of an atom?

    Found on Page 1246
  7. What is the acceleration of a silver atom as it passes through the deflecting magnet in the Stern–Gerlach experiment of Fig. 40-8 if the magnetic field gradient is 1.4 T/mm?

    Found on Page 1247
  8. Figure 40-21 shows partial energy-level diagrams for the helium and neon atoms that are involved in the operation of a helium–neon laser. It is said that a helium atom in stateE3 can collide with a neon atom in its ground state and raise the neon atom to state E2. The energy of helium state E3(20.61eV)is close to, but not exactly equal to, the energy of neon state role="math" localid="1661494292758" E2(20.66eV). How can the energy transfer take place if these energies are not exactly equal?

    Found on Page 1246
  9. Suppose that a hydrogen atom in its ground state moves 80 cm through and perpendicular to a vertical magnetic field that has a magnetic field gradientdBdz=1.6×102T . (a) What is the magnitude of force exerted by the field gradient on the atom due to the magnetic moment of the atom’s electron, which we take to be Bohr magnetron? (b) What is the vertical displacement of the atom in the 80cm of travel if its speed is 1.2×105m/s?

    Found on Page 1247
  10. The x-ray spectrum of Fig. 40-13 is for 35.0 keV electrons striking a molybdenum ( Z = 42 ) target. If you substitute a silver ( Z = 47 ) target for the molybdenum target, will

    Found on Page 1246

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