课程名称︰普通物理学甲 课程性质︰必修 课程教师︰高涌泉 开课学院：理学院 开课系所︰物理系 考试日期（年月日）︰2011.04.21 考试时限（分钟）：110分钟 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : 1.(5%)(a) What is the Stefan-Boltzmann formula? (10%)(b) Why is neither a gas flame nor the Sun a perfect blackbody? Which of them is the closer approximation? 2.(5%)(a) What is the relation between Cp and Cv? (5%)(b) What is the so-called equiparition theorem? 3.(10%) An ideal rigid-gor diatomic gas expands adiabaticllyfrom an initial state P0, V0 to afinal state Pf, Vf. What is the work done by the gas? 4.(15%) An ideal rigid-rod diatomic gas is used in a Carnot engine with 2 thermal reservoirs at temperature Tc K and Th K (Tc<Th). What is the ratio of the maximum volume if the pressure drops by a factor of 2 during the isothermal expansion? 5.(10%) A thermal isolated container of volume 3V0 is divided by a partition. In one portion, of volume V0, thewre are n mol of a monatomic ideal gas at temperature T0. The other portion is empty. The partition is then broken, and the gas expands to fill the entire container. What is the change in entropy of gas? 6.(5%)(a) What is the potential energy of a dipole in an external electric field? (5%)(b) Write down the electric field vector in terms of the eletric → potential V(x) 7. An isolated spherical conductor of radius R carries a total charge Q. (10%)(a) Whatis the energy density at each point in space as a funtion of the distance r from the sphere's center? (10%)(b) Use the energy density to compute the system's total energy. 8.(10%) When a dielectric is inserted into an isolated charged parallel-plate capacitor, the viltage between the plates drops. Why? --

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