※ [本文转录自 NTU-Exam 看板] 作者: leehoni (leehoni) 看板: NTU-Exam 标题: [试题] 94下 陈政维 普通物理学甲下 期末考 时间: Fri Jun 23 15:20:35 2006 课程名称︰普通物理学甲 课程性质︰必修 课程教师︰陈政维 开课系所︰物理系 考试时间︰06/23/2006 是否需发放奖励金：是 谢谢 （如未明确表示，则不予发放） 试题 : 1.(a)Find the rest energy of a proton in electron volts. (b)If the total energy of a proton is three times its rest energy,what is the speed of the proton? 2.Aclock moves along an x axis at a speed of 6.00c and reads zero as it passes the origin. (a)Calculate the clock's Lorentz factor. (b)What times does the clock read as it passes x=180m? (haliday 习题37-21) 3.The speed of an electron is measured to be 5000 m/s,to an accuracy of 0.00300%. Find the minimum uncertainty in determining the position of this electron. 4.Singly charged sodium ions are accelerated through a potential differ ence of 300V. (a)What is the momentum acquired by such an ion? (b)What is its de Broglie wavelength(M=22.9898 g/mole)? (haliday 习题38-45) 5.A 30-eV electron is incident on a square well of height 40 eV.What is the probability yhat the electron will tunnel the barrier if its barr ier width is 0.10nm? 6.An electron is confined to a one-dimensional, infinitely deep potential energy of width L-0.10nm. (a)What is the smallest amount of energy the electron can have? (b)If the electron gains energy for the jump from energy level E1 to energy E3,what light wave-length is required? 7.Five electrons are confined to the rectangular corral with widths Lx=L and Ly=2L. (a)What is the total energy of the five-electron system in its ground state, as a multiple of h^2/8mL^2? (b)How much energy must be transferred to the system for it to jump to its first excited state? 8.The fermi energy for silver is 5.5eV. At T=300k, What is the probability that a quantum state whose energy is 5.6eV will be occupied? 9.A sample of yhe isotope 131I,which has a half-life of 8.04 days,has an activity of 5mCi at the time of shipment. Upon receipt in a medical labo ratory, the activity is 4.2mCi. How much tine has elasped between the two measurements? 10.Please explain:(a)the photoelectric effect and(b)n-type semiconductor electron's m=9.11*10^-31kg; proton's m=1.67*10^-27kg --

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