課程名稱︰普通物理學甲下 課程性質︰化學系必修、地質系選修 課程教師︰張寶棣 開課學院：理學院 開課系所︰化學系 考試日期（年月日）︰2016.6.22 考試時限（分鐘）：110（延長至140） 試題 : 1. Please answer the following question. >What is right-handed elliptically polarized light? What is Fermat's principle in explaining the reflection and refraction of light? (5%) >Explain the cause of magnetism. What is hysteresis? (5%) >What is Eddy current? Why is it important that each slit is as narrow as possible in the Young's double-slit experiment? (5%) 2. Two parallel rails with negligible resistance are 10.0 cm apart and are connected by a 5.0 Ω resister. The circuit also contains two metal rods having resistance of 10.0 Ω and 15.0 Ω sliding along the rails (see Fig. 1). The rods are pulled away from the resister at constant speeds of 4.0 m/s and 2.0 m/s, respectively. A uniform magnetic field of magnitude 0.01 T is applied perpendicular to the plane of the rails. Determine the current of the 5.0-Ω resistor. (10%) 3. House current, which has an rms voltage of 110 V and a frequency of 60 Hz, drives a resistor of a variable inductance, connected in series. (a) What is the power absorbed by the circuit if L = 10 mH? (b) What would be the power drawn be if the resistance were halved without changing the setting of the inductance? (c) What is the maximum power drawn in part (b)? (15%) 4. The switch in Fig. 2 is connected to a point a for a long time. After the switch is thrown to point b, what are the (a) frequency of oscillation of the LC circuit, (b) the maximum current in the inductor, and (c) the total energy of circuit possesses at t = 2.0s? (12%) 5. The magnitude of the electric field between the two circular parallel plates in Fig. 3 is E = (4.0 x 10^5) - (6.0 x 10^4t), with E in volts per meter and t in seconds. At t = 0, E is upward. The plate area is 6.0 x 10^(-2) m^2. For t >= 0, what are the (a) the magnitude and (b) the direction (up or down) of the displacement current between the plates and (c) is the direction of the induced magnetic field clockwise or counterclockwise in the figure? (13%) 6. A plane electromagnetic wave has an intensity of 750 W/m^2. A flat, rectangular surface of dimensions of 50.0 cm x 100 cm is placed perpendicular to the direction of the wave. The surface absorbs half of the energy and reflects energy and reflects half. Calculate (a) the total energy absorbed by the surface in 1.00 s and (b) the momentum absorbed in this time. (10%) 7. In Fig. 4a, an unpolarized light is sent into a system of three polarizing sheets. The angles θ1, θ2, and θ3 of the polarization directions are measures counterclockwise from the positive direction of the y axis (they are not drawn to scale). Angles θ1 and θ3 are fixed but angle θ2 can be varied. Figure 4b gives the intensity of the light emerging from sheet 3 as a function of θ2. (The scale of the intensity axis is not indicated.) What percentage of the light's initial intensity is transmitted by the system when θ2 = 35°? (10%) 8. Light of wavelength 620 nm passes through a double slit, yielding a diffraction pattern whose graph of intensity I versus angular position θis shown in Fig. 5. Calculate (a) the slit width (b) the slit separation. (c) Verify the displayed intensities of the m =1 and m = 2 interference fringes. (15%) http://imgur.com/a/5FBcT --

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