The speed of sound Sound waves are longitudinal mechanical waves that can travel through solids, liquids, or gases. The speed of a sound wave in medium(having bulk modulus(容变弹性模量)and density p) is:

Chapter 34Quantum Mechanics 1. Heisenberg Uncertainty Principle 2. Schrodinger's Equation

爱因斯坦: Albert einstein 现代时空的创始人(1879-1955)

Chapter 26 Sources of Magnetic Field 1. Biot-savart's law 2. Magnetic Flux and Gauss'Law 3 Amperes Law 4. Magnetic Materials

Chapter 28 Inductance and Electromagnetic Oscillations 1. Self and Mutual Induction 2. Energy Stored in a Magnetic Field

Chapter 27 Electro-Magnetic Induction and Faraday's Law 1. The Law of Electro-Magnetic Induction 2. Motional Induced Emf

Chapter 22Conductor Dielectrics. ElectricEnergy Storage Capacitance Dielectrics Energy Stored in an Electric Field

Chapter 21 Electric Potential 1. Electric Potential and Potential Difference 2. Relation Between Electric Potential and Electric Field 3. The Calculation of Electric Potential 4. Equipotential Surfaces 5. Electrostatic Potential Energy

Chapter 20 Gauss's Law A statement of the relationship between electric charge and electric field. Electric Flux 2 Gauss's Law 3 Application of Gauss's Law

Introduction Some questions you concern: 1 Why should we study English? 2 Why we study physics in English? 3 How about the achievement in final exam? 4 Is it helpful for your future career to study physics in English?