大学物理大学物理下 (42).ppt
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1、16-1.6-1.Types of wavesCollege Physics II平台标位置预留OBJECTIVESDescribe the characteristics of a wave;Explain the difference between longitudinal and transverse waves;List the different types of waves.What is a wave?It is the process of propagating oscillation in space.What are transmitted by a wave?Ener
2、gy,momentum,phase,but NOT the particlesCollege Physics II平台标位置预留In this part,we consider only mechanical waves.Elastic mediums An initial disturbanceConditions for a mechanical wave1.Transverse wavesThe direction of oscillation of medium elements is perpendicular to the traveling direction of the wa
3、ve.College Physics II平台标位置预留2.Longitudinal wavesThe oscillation direction of medium elements is parallel to the traveling direction of the wave.Wave surface,wave-front and rayCollege Physics II平台标位置预留Plane waves:The wavefronts are planes.Spherical waves:The wavefronts are spherical.*Spherical wavePlane wavewave-frontwave surfacerayRay:A line showing the wave propagation direction.Wave surface:The surface of all the points with the same phase.Wave-surface Ray
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