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Theoretical and error analysis of Millikan’s oil-drop experiment YANG Jin-song, ZENG Da-peng, CHEN Jie College Physics    2018, 37 (12): 37-.   DOI: 10.16854 /j.cnki.1000-0712.180275 Abstract （10983）      PDF（pc） （535KB）（1533）       Knowledge map    Save Millikan and his student designed the oil-drop experiment，which plays an important role in the history of physics，to reveal that magnitude of any charged bodies takes separation value，and determine magnitude of the electron’s change. Suitable choices for oil-drop will help us to improve the measuring accuracy. Some books about physical experiment provided choice rules，however it is not explained the reasons why we shall make that choices. In this paper，we focus on choice rules for the oil-drop experiment，and reveal the physical reasons by combining theoretical and error analysis. These results presented in this paper will provide theoretical support for choice rules of oil-drop. Related Articles | Metrics | Comments（0）

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1988, 1 (10): 42-42.   Abstract （10904）      PDF（pc） （215KB）（1011）       Knowledge map    Save Related Articles | Metrics | Comments（0）

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The dynamic method in Millikan oil-drop experiment CHEN Shang-ming, LI Liang-feng, PAN Qi College Physics    2020, 39 (04): 60-66.   DOI: 10.16854 / j.cnki.1000-0712.190290 Abstract （10853）      PDF（pc） （914KB）（4007）       Knowledge map    Save In this paper the dynamic method of measuring the electric charge quantity of oil droplets is explored. Through the analysis of the dynamic process model，equations of the dynamic method for solving the charge quantity of oil droplets are obtained. A program of data processing for measuring the micro-electric charges by dynamic method is designed，which makes the dynamic method applied more easily in teaching. In addition，the analysis enriches the physical connotation of Millikan oil-drop experiment and deeps the understanding of the theoretical knowledge. The exploration results have an important and significant reference to the in-depth understanding of the process of oil-droplet electric charge measurement by the dynamic method. Related Articles | Metrics | Comments（0）

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1986, 1 (5): 25-25.   Abstract （9089）      PDF（pc） （412KB）（987）       Knowledge map    Save Related Articles | Metrics | Comments（0）

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Application of measurement uncertainty analysis in university physics experiments — gravity acceleration measured by single-swing ZHANG Zhu li, CHEN Xin lei, LU Mei hong College Physics    2022, 41 (2): 31-.   DOI: 10.16854/j.cnki.1000-0712.200521 Abstract （8949）      PDF（pc） （826KB）（1375）       Knowledge map    Save Gravity acceleration is an important mechanical constant in physics. There are many methods to measure the value of gravity acceleration, and the simple pendulum method is often used in university physics experiments. However, the experimental principle only studies the motion of the single pendulum ball and ignores the influence of the size of pendulum, buoyancy, cycloid mass and other factors, so the measurement results are not accurate enough. The relative accurate formula of gravity acceleration and the corresponding synthetic standard uncertainty formula are obtained by correcting the system error that caused in the measurement of gravity acceleration by the simple pendulum method. Finally, the measured data are analyzed and calculated reasonably, and the more accurate experimental results are obtained. Related Articles | Metrics | Comments（0）

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1986, 1 (11): 41-41.   Abstract （8810）      PDF（pc） （164KB）（2499）       Knowledge map    Save Related Articles | Metrics | Comments（0）

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1987, 1 (6): 1-1.   Abstract （8599）      PDF（pc） （183KB）（3405）       Knowledge map    Save Related Articles | Metrics | Comments（0）

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Uncertainty　of　Millikan's　oil　drop　experiment ZENG　Xiao-qi，SHAO　Ming-zhen，CHEN　Ji，YANG　Jun College Physics    2017, 36 (12): 37-40.   DOI: 10.16854/j.cnki.1000-0712.2017.12.010 Abstract （7378）      PDF（pc） （749KB）（2876）       Knowledge map    Save In　the　Millikan's　oil　drop　experiment，the　more　electric　charge　the　oil　drop　carries，the　larger　measurement　uncertainty is.According　to　the　calculation　of　uncertainty，we　analyze　quantitatively　how　to　balance　the　measurement　uncertainty　and the　droplet　charge.Our　results　will　be　helpful　for　choosing　oil　droplets　and　controlling　the　experimental　uncertainty. Related Articles | Metrics | Comments（0）

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1983, 1 (2): 3-3.   Abstract （7066）      PDF（pc） （306KB）（3035）       Knowledge map    Save Related Articles | Metrics | Comments（0）

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Analysis of two-dimensional hexagonal lattice structure and vibration mode using graphene as an example WANG Qing-qing, CHENG Rong-long, GONG Hao College Physics    2019, 38 (6): 24-.   DOI: 10.16854 /j.cnki.10000712.180487 Abstract （6652）      PDF（pc） （505KB）（2315）       Knowledge map    Save Graphene has become one of the most widely used new materials because of its unique hexagonal lattice structure，which has excellent mechanical， thermal，optical and electrical properties.From the point of view of solid state physics teaching， taking the lattice structure of single-layer graphene as an example， this paper describes the normal lattice primitive cell and base vector， inverted lattice primitive cell and base vector，wave vector space and first Brillouin region of two-dimensional hexagonal lattice in the form of images，and derives the vibration mode of two-dimensional hexagonal lattice. Related Articles | Metrics | Comments（0）

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Several measuring methods of the refractive index of liquid    2007, 26 (1): 34-34.   Abstract （6349）      PDF（pc） （346KB）（2386）       Knowledge map    Save Five measuring methods of refractive index of liquid are introduced. It includes method of irradiation of laser, method of diffraction grating, method of optical fiber Young＇s interference, method of Abbemat refractometer, and method of measuring by CCD. All of these methods are simple for operation, and their principles are easy to understand. The characters of each method are also analysed. Related Articles | Metrics | Comments（0）

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1987, 1 (12): 19-19.   Abstract （6135）      PDF（pc） （545KB）（2219）       Knowledge map    Save Related Articles | Metrics | Comments（0）

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Principle of hand-operated electrostatic induction motor LU Jun-ling, GU Chen, QIN Lian-hua, REN Nai-jing, MA Bo-yi College Physics    2019, 38 (12): 36-.   DOI: 10.1685 /j.cnki.1000-0712.180703 Abstract （5904）      PDF（pc） （886KB）（965）       Knowledge map    Save Hand-operated electrostatic induction motor is a charge amplifier with positive feedback when the handle moves clockwise. If there is a certain initial charge on the capacitor of Leighton bottle，the electrostatic induction will appear on the metal brush generated by the charge on the exposed part of the capacitor electrode，and the positive and negative charges will appear at both ends of the brush. When the insulation turntable rotates，the conductor foil on it will carry net charges after sliding through the metal brush. When conductor foils meet collector forks connected to the capacitor electrodes of the Leighton bottle separately， the Leighton bottle is charged by the tip discharge，and the charge in the Leighton bottle is increasing. Related Articles | Metrics | Comments（0）

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College Physics    1985, 1 (10): 15-15.   Abstract （5743）      PDF（pc） （146KB）（489）       Knowledge map    Save   Reference | Related Articles | Metrics | Comments（0）

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1983, 1 (9): 17-17.   Abstract （5699）      PDF（pc） （422KB）（1114）       Knowledge map    Save Related Articles | Metrics | Comments（0）

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1984, 1 (11): 33-33.   Abstract （5677）      PDF（pc） （163KB）（1766）       Knowledge map    Save Related Articles | Metrics | Comments（0）

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1988, 1 (5): 42-42.   Abstract （5645）      PDF（pc） （273KB）（1137）       Knowledge map    Save Related Articles | Metrics | Comments（0）

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1988, 1 (12): 12-12.   Abstract （5203）      PDF（pc） （182KB）（786）       Knowledge map    Save Related Articles | Metrics | Comments（0）

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An alternative approach to test the acceleration of gravity by using sensors in smartphone RAO Di, CHENG Min-xi College Physics    2019, 38 (1): 37-.   DOI: 10.16854 /j.cnki.1000-0712.180232 Abstract （4790）      PDF（pc） （319KB）（1453）       Knowledge map    Save One experiment is designed by using the sensors in smartphone including pressure sensor，temperature sensor. The acceleration of gravity is obtained through linear fitting by measuring the relationship between relative altitude and air pressure. This new method needs not additional equipment and the experimental procedure is easy to do. Related Articles | Metrics | Comments（0）

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College Physics    1995, 14 (3): 10-11.   Abstract （4764）      PDF（pc） （150KB）（1405）       Knowledge map    Save   Reference | Related Articles | Metrics | Comments（0）