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）︰2009/5/27 考试时限（分钟）：50 minutes 是否需发放奖励金：Yes （如未明确表示，则不予发放） 试题 : 1.Two isotropic point sources of light (S1 and S2) are seperated by distance 3.0μm along a y axis and emit in phase at wavelength 900 nm and at the same amplitude. A light detector is located at point P at coordinate Xp onthe x axis. What is the greatest value of Xp at which the detected light is minimum due to destructive interference? (30%) y ↑ ∣ S1∣ P ──●─────●───→x │ │ │ S2● │ │ 2.Light of wavelength 550 nm is incident normally on a diffraction grating. Twoadjacent maxima occur at angles given by sinθ = 0.2 and sinθ = 0.3. The forth-order maxima are missing. (40%) (a) What is the separation between adjacent slits ? (b) What is the smallest slit width this grating can give ? (c) For that slit width, what are the largest, second calus of the order number m of the maxima produced by the grating ? 3.Sally rides in a train moving with constant valocity v relative to a station and conduct a light pulse experiment. She sendsout a light signal and measure the time interval when the signal reflacts back, donating the time interval measured as ΔT0. Sam who stands on thet station platform as the train passes also observes the same ongoing experiment. The same time interval Sam measured is ΔT. (a) Deduce the relation between ΔT0 and ΔT. (b) What is the conclusion drawn from this observation ? --

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