CAIE ALEVEL A2物理考试知识点增加

　　这一次加的考试内容理解起来不会太难，大家不用太有负担——

　　Gravitational field

　　1. Gravitational field lines

　　2. Geostationary satellite (from communication)

　　Thermal physic

　　1.W=pΔV (from AS)

　　SHM

　　1. total energy of oscillation

　　2. Graph of different types of damping

　　Electric field

　　1. Uniform electric field (from AS)

　　Capacitor

　　1.Discharging of a capacitor

　　Magnetic field

　　1. Origin of Hall voltage and use of Hall probe

　　Quantum physics

　　1. Momentum of photon p=E/c

　　Medical physics

　　1.Minimum wavelength of X-ray

　　2.PET

　　Astrophsics

　　Totally new