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Table of Content
20 July 2016 Volume 35 Issue 7
Thinking and practice of the construction of the new form of physics textbooks in universities
MA Tian—kui，GAO Jian
College Physics. 2016, 35(7): 1-3.
Abstract
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1089
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433
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This paper introduces the construction of a new form of the combination of paper materials and new media resources，including integrated design of teaching content.This is in order to fully reflect the mixed type teaching，flipped classroom ，inquiry learning and other teaching ideas.
Quantum Zeno efect on the neutron survival probability
W ANG W ei—guang，YAN Xue—qun
College Physics. 2016, 35(7): 4-5.
Abstract
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835
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(253KB) (
393
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In the quantum theory，the quantum Zeno effect plays an important role in dealing with the quantum information.In this paper，we show how it impacts the decay of a neutron at different time intervals between measurements，and it can be seen that the quantum Zeno effect may be caused by frequent measurement.
The equal—thickness elliptic(hyperbola) fringes for two crossed column lens
ZHOU Guo—quan
College Physics. 2016, 35(7): 6-11.
Abstract
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1404
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(1130KB) (
584
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By means of classification and induction，some new variant structures of Newton—type interference apparatus for two crossed convex(or concave)column lens are found and studied，which can generate equal—thickness elliptical(or hyperbola)fringes.The interference conditions and distribution laws of the fringes are derived，analyzed，and formulized in a unified form.Compared with the original interferometer for Newton’s rings，our new designed interferometers are of not only similarity but also novelty.Thus，the academic research scope for the interferometry of Newton’s rings has been extended，and their possible technique applications are concisely indicated.
Research on the equivalent resistance of ladder resistance network based on fixed point method
JI Ying—hua，HU Ju—ju
College Physics. 2016, 35(7): 12-13.
Abstract
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854
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(246KB) (
444
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We propose a simple method for equivalent resistance of n—level ladder resistance network The method is applied in several typical ladder networks and the analytical expressions are obtained.
Study of the maximum impedance value in the RL-C parallel resonant circuit
LIU Song—shan
College Physics. 2016, 35(7): 14-16.
Abstract
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1103
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(247KB) (
975
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For a RL—C parallel resonant circuit，the relation between the maximum impedance value |Z|max and the impedance of resonant Z0 is presented strictly.The discrimination method of Z0 to be an extreme value is proposed and proved.The relative error of Z0 to |Z|max is analyzed，the relative error decreases as the circuit quality factor increases.If the Q is large enough，the difference of Z0 and |Z|max should be negligible，in this case the cireuit resonant impedance Z0=L/RC arrives at the maximum value.
The normal modes and the energy spectrums of molecular dipolar crystals
ZHOU Yan—li
College Physics. 2016, 35(7): 17-23.
Abstract
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926
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457
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The normal modes and phonon spectrums of an ensemble of polar molecules are discussed, which are prepared in a dipolar crystalline phase.Detailed results are presented for a one—dimensional dipolar chain trapped in harmonic trap and for a homogeneous dipolar crystal，respectively.
Design of experiment for target positioning based on the Doppler efect
ZHOU Zhan-rong，XU Jun，ZHOU Xuan-ke，SHEN Xiao-fang
College Physics. 2016, 35(7): 24-27.
Abstract
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1434
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823
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An experimental device for target location is designed by using the Doppler effect of sound wave.The device is that the sound source is fixed，and the receiver does circular motion around the fixed axis.During the process of receiver motion，the received frequency is changed periodically.The position of the target point can be determined by the maximum frequency and the minimum frequency.The device is not only simple in structure，low in cost，but also has high positioning accuracy.
Testing the Planck constant by reasonably defining the stopping voltage
YU Lei，DUAN Huo—lin，LIU Bin，ZHANG Li
College Physics. 2016, 35(7): 28-30.
Abstract
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1940
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PDF
(337KB) (
1780
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A new method is applied to find the stopping voltage in the experiment of testing the Planck constant in terms of the photoelectric effect.W ith this method，the experiment precision can be greatly improved.
Jones matrix analysis and experimental verification of conversion from elliptically polarized light to circularly polarized light
WANG Chao，JIANG Lun，DONG Ke—yan，AN Yan，JIANG Hui—lin
College Physics. 2016, 35(7): 31-36.
Abstract
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1964
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PDF
(1215KB) (
1041
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Using the Jones Matrix， we derive the parameters of the single wave plates or the double quarter—wave plates for converting the elliptically polarized light to circularly polarized light. To the double—wave—plate method，the influences of the rotating angle errors in the first or the second wave plates are quantitatively analyzed and validated through the experiment.
Microwave spectrometer verifying Scherrer equation
ZHUANG Shi—hao，GU Min—yu，DU Ai，ZHANG Zhi—hua，FANG Kai
College Physics. 2016, 35(7): 37-41.
Abstract
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1190
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PDF
(760KB) (
871
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We conduct a microwave spectrometer experiment to verify Scherrer equation.W e derive the equation without approximation to meet the requirement of our experiment.The model, using XRD method, is tested with the microwave spectrometer and the result is analyzed，we have found that it follows the rule indicated by the equation qualitatively.W e process the data with software and the result is in agreement well with the mathematic expression formulated by Scherrer equation.W e analyze the elror at last，promoting the understanding of Scherrer equation.The experiment verifies Scherrer equation and the viability of our model，enriches teaching content of microwave spectrometer experimental project and improves students’innovation in building physical mode1.
Study of solid linear expansion coefi cient by alternating --- current bridge
LI Ru-song，MA Hong-mei，XU Qin
College Physics. 2016, 35(7): 42-46.
Abstract
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1172
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964
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We proposed a new method for measuring the solid linear expansion coefficient by alternating—current bridge(AC bridge)，which can be used to measure small capacitance.Converting solid tiny length change into AC bridge capacitance change.W e realized the accnrate measurement of solid linear expansion coefficient.W e made a rectangle plane—parallel capacitor as the capacitance of AC bridge whose bottom plate was supporting by testing metal bar.When the metal bar was heated，it expanded.So the gap of capacitor was minimized，and the capaeitance was changed.For reducing the temperature gradient of heating system，we added some experiment instruments of viscosity and temperature sensor into traditional steam jet heat meter.The experimental results showed that the method was simple，had high measuring accuracy and small error.
Calculate of Fraunhofer difraction by linear transformation
ZHANG Wen-yu，DAI You-shan
College Physics. 2016, 35(7): 47-55.
Abstract
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1084
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688
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Fraunhofer diffraction transforms in a simple way under a linear deformation of the shape of thetwo-dimensional aperture.Based on simple linear transformation，we derive general analytic expressions for the diffraction amplitude in the case of triangular and rhomboidal apertures of arbitrary shape at any given position in a coordinate system.Without performing integration，we solve the Fraunhofer diffraction by any polygon aperture of any shape，through purely algebraic operations.As an example，we apply the present method to find the diffraction intensity distribution for a regular hexagon aperture，and simulate it on a computer based on our analytical results.
Velocity measurement of muons
LIU Wen-bin，LI Hai-peng，LI Ming，XIAO Yang，SUN Bao-hua，ZHANG Gao-long
College Physics. 2016, 35(7): 56-58.
Abstract
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1017
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(590KB) (
827
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Evepy second the living creatures on earth are subject to muon irradiation.Here an experiment in the level of undergraduate student majoring in nuclear physics related science is introduced aiming to measure the mean velocity of cosmic muons.The mean velocity of muons at around the sea level is determined as with the time-of-flight method.This experiment can be used for teaching in labs of nlodern physics，nuclear physics or frontier physics.It requires that the students understand the high energy cosmic ray and the basic method for radiation detection.
Research on the relationship between Max Born and Heisenberg
HOU Yu-de,XING Hong-fei
College Physics. 2016, 35(7): 60-65.
Abstract
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901
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(718KB) (
962
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The relation between Born and Heisenberg was very important to Heisenberg， it also gave huge influence to Born.Without Born’S help，Heisenberg had little chance to be the major founder of quantum mechanics.The important contribute of Max Born was fade and buried due to the improper words of Heisenberg (also because of wrong words of Born himself to especially exaggerate Heisenberg’s prominent role) for so many years.The fact that could not get the Nobel Prize gave worst influence to Max Born's half later lifetime.The lessons on Born's way to handing the relationship with his doctoral and postdoctoral students are worth paying attention to research by all the leaders of academic school.
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