课程名称︰普通物理甲下 课程性质︰必 课程教师︰赵治宇 开课学院：理 开课系所︰物理 考试日期（年月日）︰100/6/23 考试时限（分钟）：3 hrs 是否需发放奖励金：yes （如未明确表示，则不予发放） 试题 : 12题，满分100。 1. What's the working principle of tape recording and playback in a video tape recorder? (4%,4%) 2. Design an experiment to show the existence of diamagnetic material. (8%) 3. Describe (a) the behavior of electric field of a partially polarized light and (b) the difference bwtween unpolarized light and circularly polarized light. (4%, 6%) 4. In a double-slit experiment, the wavelength s of the light source is 405nm, the slit separation d is 19.44 um, and the slit width is 4.05 um. How many bright fringes are within the central peak of the diffraction envelop? (8%) 5. Derive the speed of light c in vacuum space in (a) amplitude ratio form and (b) in terms of (电磁的那两个常数 (mu, epison)打不出来). (8%) 6. Figure 1 shows a cross section of a long thin ribbon of width w that is carring a uniformly distributed total current i into the page. In unit vector notion, what is the magnetic feild B at a point P in the plane of the ribbon at a distance d from its edge? (8%) Figure 1. | y axis | | | P------============ ---长度=d , ======长度=w 电流在===上，方向进入萤幕。 to be continued... -- 十年生死两茫茫，不思量，自难忘，千里孤坟，无处话凄凉。 纵使相逢应不识，尘满面 ，鬓如霜。 夜来幽梦忽还乡，小轩窗，正梳妆，相顾无言，唯有泪千行。 料得年年肠断处 ，明月夜 ，短松冈。 --

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