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Waves
Waves
11
Physics
11/09/2008

Term
 Periodic Motion
Definition
 If an object oscillates back and forth over the same distance and each cycle taking the same amount of time.
Term
 Spring force
Definition
 Fsp=-kxThe minus sign means it is a restoring force
Term
 Simple Harmonic Motion (2)
Definition
 Restoring force is proportional to the negative of the displacementSHM waves are sinusoidal
Term
 Waves Amplitute, AWavelength, λFrequency, f Period, TWave VelocityCrest/Trough
Definition
 vwave = λf[image]λ = v/f
Term
 longitudinal waves (2) i.e.
Definition
 the motion of particles in the wave move parallel to iti.e. sound waves, earthquakescan move through liquid-in the transverse direction
Term
 Transverse
Definition
 The motion of particles in the wave are perpendicular to it (sin)i.e. earthquakes
Term
 Intensity (3)
Definition
 power/areaIαAmplitude2Iα1/r2
Term
 Damped Harmonic Motion (3)
Definition
 Harmonic motion with frictional force or dragunwanted-clocks, pendulumswanted-shock absorbers, earthquake protection
Term
 Law of Reflection
Definition
 angle of incidence equals angle of reflection
Term
 Refraction
Definition
 When wave enters a medium where wave speed is different, wave fronts and rays will change direction (rays are perpendicular to fronts)[image]
Term
 Law of Diffraction
Definition
 Waves bend around an obstacle, leaving a shadow region
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