![]() ![]() Is this your diamond? College Physics-by Dr.H.Huang, Department of Applied Physics The next day you weigh the returned diamond again, getting 8.09 grams. ![]() The scale’s accuracy is claimed to be☐.05 grams. You are a bit worried, so you carefully have your diamond weighed on a scale which reads 8.17 grams. Example: A friend asks to borrow your precious diamond for a day to show her family. One advantage of scientific notation is that it allows the number of significant figures to be clearly expressed. To express the very large and very small quantities, we use the so called scientific notation. However, when you come to the final result, you should round off according to the original data with the least significant figures. If multiple steps of calculation are involved, you should retain more significant figures than the original data have. In general, no final result should have more significant figures than the original data from which it was derived. Significant Figures (有效数字) The number of reliably known digits in a number is call the number of significant figures. Many SI derived units are defined in terms of these base units. Measurement SI Unit: In 1971, the 14th General conference on Weights and Measures picked seven quantities as base quantities, thereby forming the basis of the International System of Units, abbreviated SI from its French name and popularly known as the metric system. College Physics-by Dr.H.Huang, Department of Applied Physics A second mass standard is the carbon-12 atom, which has been assigned a mass of 12 atomic mass units (u) SI Unit: In 1971, the 14th General conference on Weights and Measures picked seven quantities as base quantities, thereby forming the basis of the International System of Units, abbreviated SI from its French name and popularly known as the metric system. The standard of one kilogram is the mass of a platinum-iridium cylinder kept at the International Bureau of Weights and Measures near Paris (1889). ![]() ![]() The standard of one second is the time taken by 9,192,631,770 vibrations of the light (of a specified wavelength (波长)) emitted by a cesium-133 atom (1967). The standard of one meter is the length of the path traveled by light in vacuum (真空) during a time interval of 1/299,792,458 of a second (1983). Other physical quantities are defined in terms of the base quantities and their standards and units. Certain physical quantities have been chosen as base quantities, such as length (长度), time (时间), and mass (质量), each has been defined in terms of a standard (标准) and given a unit (单位) measure, such as meter, second, and kilogram. Measurement Measurement in Physics: Physics is based on measurement of physical quantities. College Physics-by Dr.H.Huang, Department of Applied PhysicsĮssence of Physics Classical Mechanics: Newton’s law Electrodynamics: Maxwell’s equations Optics: Fermat’s principle Thermodynamics: First, second and third laws Quantum Mechanics Schrödinger’s equation College Physics-by Dr.H.Huang, Department of Applied Physics The study of physics uses skills that are useful in other fields as well. The Principles of Quantum Mechanics, P.A.M.Dirac Assessment Weighting: Continuous Assessment: Lab (and report): 16% Quiz (and midterm exam): 24% Final Exam: 60% (Minimum requirement: D) Minimum requirement for overall grade: D College Physics-by Dr.H.Huang, Department of Applied PhysicsĬlassical Mechanics Electrodynamics Physics Optics Thermodynamics Quantum Mechanics The fundamentals of physics need to be understood by anyone who hopes to make a career in the sciences or technology: physicists, engineers, chemists, astronomers, mathematicians, geologist, or biologists. Classical Electrodynamics, J.D.Jackson Quantum Theory of the Solid State, J.Callaway Principles of Optics, M.Born et al. Highly Recommended References: For beginners: Berkeley Physics Course (V.1-5) 力学,赵景员,王淑贤 热力学,王竹溪; 电磁学,赵凯华,陈熙谋; 光学,赵凯华,钟锡华 Intermediate: The Feynman Lectures on Physics, R.P.Feynman, et al. College Physics (AP101) Dr.Haitao Huang (黄海涛) Department of Applied Physics, Hong Kong PolyU Tel: 27665694 Office: CD613 Lecture Notes can be downloaded from Textbooks: Physics for Scientist & Engineers, D.C.Giancoli, Prentice Hall Fundamentals of Physics, D.Halliday et al., John Willey & Sons College Physics, A.Giambattista et al., McGraw Hill University Physics, H.D.Young et al., Pearson Physics for Scientist & Engineers, R.D.Knight, Pearson Resources: Multimedia Lab: CD706 College Physics-by Dr.H.Huang, Department of Applied Physics ![]()
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