固体物理考题及谜底一(国外英文资料).doc

固体物理考题及答案一(国外英文资料) One, choose the question (30 points, 3 points per question) Objective: to assess the basic knowledge. 1, the face centered cubic lattice of the lattice constant, which is equal to D. A. b. b. c. d. The density of the center is C. A. 0.76 b. 0.74 c. 0.68 The basic symmetry of the macroscopic symmetry of A crystal has A. A. eight b. 48 c. 230 d. 320 The one-dimensional double atomic chain of the lattice constant, the size of the lattice base vector is D. A. b. b. c. d. The spacing of the lattice constants is A. A. b. b. c. d. The energy quantum of the lattice vibrations is called C A. the polaron b. exciton c. sound A simple crystal consisting of N cells, without considering the band, the number of electrons per s can hold is C. A. N. N The energy state density of free electrons in three dimensions is proportional to the energy of C. A. b. b. c. d. The Fermi of a certain crystal can be determined The size of the electron concentration in the crystal The experimental method of electronic quality is C. A. X-ray diffraction b. neutron inelastic scattering c. cyclotron resonance d. horear effect Two, Jane answered the question (20 points, 5 cents each) 1, what is the relation between the wave vector space and the reciprocal space? Why is it that the state points in the wave vector space are quasi-continuous? Wave vector space and pour in a unified space lattice space, lattice space base vector, respectively, and the wave vector space vector, respectively, N1, N2 and N3 are respectively along the direction vector of positive grid original cell number of the crystal. The volume of a inverted lattice in the inverted space is zero , The volume of a wave vector in the wave vector space is equal to the volume , A wave vector point in the wave vector space corresponding to the volume of the, is a fall in lattice space lattice corresponds to the volume of 1 / N. Due to N, and the crystal cell number, the number of large, so the volume of a wave vector point co