原po少了两个图我帮他补图 (补图以紫色表示) [不专业的原po] ------------------------------------------------------------------------------ 课程名称︰普通物理甲(下) 课程性质︰大一共同必修 课程教师︰黄晖理 开课学院：生农学院 开课系所︰生物产业机电工程学系 考试日期（年月日）︰2009/6/18 考试时限（分钟）：100分钟 是否需发放奖励金：是 （如未明确表示，则不予发放） 试题 : 一、简答题(9x5=45%) 1. What is meant by "Tranverse Doppler Effect" 2. Explain that how optical fiber transmit signal 3. Light travels in vaccum with wavelenth λ and velocity c. What are the corresponding wavelength and velocity of the light when it is traveling in a medium with refractive index n? 4.The important four electromagnetic laws are gererally known as the Maxwell equations. Yet, curiously enough, Maxwell completely did not have a hand in three of the four equations, with exceptions called the Ampere-Maxwell law. Explain why shoulld these equations called the "Maxwell equations"? 5.Why an incident light changes its phase by π when it is reflected from an interface with higher refraction index? 6.Give a sample explanation of what is meant by Scanning Tunneling Microscope or simply STM? 7.Why Einstein;s theory of "photoelectric effect" is so important? 8.In 1923, Authur Compton successfully demonstrated his well known "Compton scattering" experiment. What has he proved? What is the Compton well length. 9.An electron is trapped in an 1-dimemsional infinite potential well of width b.WRITE down the normalized wave function and the quantized energy levels En 二计算题(4x14=56%) 1. A glas plate(n=1.61)is coverd with a thin uniform layer of oil(n=1.2) A monochromatic light beam in air is incident normally on the oil surface. Observation of the reflected beam shows destructive interference at 500 nm and constructive at 750 nm, with no intervening maxima or minima. What is the thickness if the oil film? │ ─┼─ │ │ ↓ air ───────────────── n = 1.2 oil ───────────────── n = 1.61 glass 2. Assume that the minimum energy needed to extract an electron from a certain metal us 2.20eV (a)What is the threshold frequency of light needed to knock out electrons from the metal surface? (b)What is the maxium kinetic energy of photoelectrons in eV when the surface is illuminated with a light of frequency 8.0x10^14Hz (c)If the stopping potential of the photoelectrons is 0.44V, what is the frequency of incident light? 3.The switch S in the figure is closed at t=0. How long does it take when the current in the inductor reaches ε/2RL? S ┌─→─/\/\/\/\─/ ─┬───┐ │ R1 / │ │ \R2 § │ / § -─- ε \ § L -- / § │ \ │ └──────────────┘ 4.Show that the time for the light to go from A to B is a minimum if n1sinθ1=n2sinθ2 ╲ │ ╲ │ ↘ θ1│ ╲ │ ╲│ n1 ─────┼────── │╲ │ ↘ n2 │θ2 ╲ │ ╲ --

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