Chapter 25 Magnetism 1. Magnet and Magnetic Field 2. Definition of Magnetic Field 3. Force on an Electric Charge Moving in a Magnetic Field 4. Torque on a Current Loop
Chapter 13 &14 Wave Motion and Sound 1. Simple Harmonic Waves 2. Wave Equation 3. Energy and Power of Waves Interference of Waves Standing Waves 1. The Doppler Effect
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: