Final Examination of Physics II for 2009 Mixed Class普通物理学真题试卷试题

浙江大学2010-2011学年秋冬学期

《普通物理学 II》课程期末考试试卷

课程号：061R0070_，开课学院：__理学院___

考试试卷：√A卷、B卷（请在选定项上打√）

考试形式：√闭、开卷（请在选定项上打√），允许带_计算器_入场

考试日期： 2011 年 01 月 17 日,考试时间： 120 分钟

诚信考试，沉着应考，杜绝违纪。

考生姓名：学号：所属院系： _

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h=6.63⨯10-34J·s

I. Fill in the space underlined. (35%)

1. Figure 1shows a Thomson atom model of helium (He, Z=2). Two electrons, at rest, are

embedded inside a uniform sphere of positive charge 2e. The distance d between the electrons is so that the configuration is in static equilibrium.

2. Two long wires a distance b apart carry antiparallel currents i, as in Figure 2. The magnetic

induction strength B at point P, which is equidistant from the wires, is given by .

3. For the charge configuration of Figure 3, the electric potential V(r)for points on the vertical

axis, assuming r>>d is given by . Set V=0 at infinity.

4. A broad source of light (λ=680nm) illuminates normally two glass plates 120mm long that

touch at one end and are separated by a wire 0.048mm in diameter at the other end (Fig. 4).

How many bright fringes appear over the 120-mm distance? . 5．What would be the action of a quarter-wave plate (λ/4波片)on the linearly polarized (assume the plane of vibration to be at 45o to the optic axis of the plate).

6. The de Broglie’s wavelength of a 1.00-KeV electron is of .

7. Stationary state Schrödinger’s Equation(定态薛定谔方程) for one dimensional system is:

II. Multiple Choice (Choose all the apply, 20%)

1.Which of the following does not significantly contribute to the magnetic properties of a

substance?

(A)Orbital magnetic moments of electrons. (B) Spin magnetic moments of electrons

(C) Magnetic moments of protons and neutrons. (D) All contribute equally.

2.Two ideal polarizing sheets are stacked so that none of the incident unpolarized light is

transmitted. A third polarizing sheet is slipped between the first two sheets at an angle of 45o to the bottom sheet. The fraction of light transmitted through the entire stack is:

(A) 1/2 (B) 1/4 (C) 1/8 (D) Still zero

3.The diffraction pattern of a single slit is observed with green light. The green light is then

replaced by red light. Which of the following changes will allow the locations of the diffraction minima on the screen to remain unaffected by the change of light color?

(A) Increase the width of the slit. (B) Decrease the width of the slit.

(C) Move the lens-screen combination way from the slit. (D) Increase the intensity of the light

source.