课程名称︰普通化学丙 课程性质︰必修 课程教师︰周必泰 开课学院：医学院 开课系所︰医学系 考试日期（年月日）︰100/01/05 考试时限（分钟）：30分 是否需发放奖励金：是 （如未明确表示，则不予发放） 1.Explain two types of defects created in crystalline ionic solids. (1)Schottky defects & (2)Frenkel defects (10) 2.The band gap in aluminum phosphide (AlP) is 2.5 electron-volts (the charge of electron is 1.6 x 10^-19 Coulomb.) What wavelength of light is emitted by an AlP diode? (10) 3. A. Use the vand model to explain how conductors and semiconductors differ as to the effect of temperature on electrical conductivity.(10) B. Using silicon semiconductors as a model, define the n-type and p-type semiconductors.(10) 4. (Give a phase diagram of water) The phase diagram for water in a close system is shown below, in which points A-F represent the condition of water at a specific pressure and temperature. Please answer the following questions. 1. Where is triple point? And how many degree of freedom in triple point? (5) 2. Which point indicates that the density of gas and liquid is identical? (5) 3. Which point represents the solid-liquid-gas equilirium? (5) 4. Explain the negative slope for the line B-E.(5) -- --

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