课程名称︰近代物理 课程性质︰系定选修 课程教师︰杨志忠 开课学院：电机资讯学院 开课系所︰电机工程学系 考试日期（年月日）︰6/24 考试时限（分钟）：180 min 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : 简答题20题(凭印象未照顺序) 1.Which wlwctron property was discovered based on the anmalous Zeeman Effect by applying a strong magnetic field to an stom? 2.Explain what causes the property of ferromagnetism in the metal like iron, cobalt and nickel. 3.Among the three statistical distributions, which one is suitable for describing a phonon, which means the vibratiob of an atom in a crystalline structure? Can many phonons stay in a single energy state? 4.What kind of motion makes the major contribution to the heat or temperature in a solid? 5.What kind of dislocation in a metal result in the property of ductility? How does it happen? 6.Does the following chemical process absorb energy or release energy? Na + Cl -> Na^+ + Cl^- 7.Compare the strength of the ionic bond, metallic bond, covalent bond, and Van der Waal bond. 8.What factor makes the volume expand when water freezes into ice? 9.Explain why diamond is an insulator and Si crystal is a semiconductor enen though they have the same crystal structure. 10.What property of a photon in the quantum theory correspond to the polar characteristics of an electromagnetic wave? 11.What is the physical meaning if the Fermi energy in the Fermi-Dirac distribution? 12.Explain what are the conduction band and valence band of a semi conductor. 13.Please explain a general rule for the selection rule of electron transition regarding the polarities of the wave function of the initial and final ststes. 14.How to eplain the difference of the specific heat of a solid between the experimental data and the theory based on the boltzmann dis tribution when the temperature is low? 15.Please explain briefly why the electron kinetic energy in a metal or semiconductor contributies insignificantly to demperature variation at room temperature. 16.Explain how the van der Waals bond is formed between a polar and a non-polar molecule. 17.What is the origin of thhe ferromagnetism? 18.In a quantum well of three quantized state, what photon-selection can occur? 19.What is the physical meanig oh the relationship between the concept of displacement and the selection rules of electron transition between two energy states. 20.What is the factor determining the Madeling Constant? --

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