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声音的传播声音是由物体的振动产生的,正在振动发声的物体叫做声源。声音的传播需要介质,固体、液体、气体都可以传声,真空不能传声,月球上没有空气,所以登上月球的宇航员即使相距很近也要靠无线电话交谈。光的传播自身能够发光的物体叫光源。我们用光线表示光的传播路径与方向,实际上光线只是一个假想的模型,并不存在。光在同一种均匀介质中是沿直线传播的,光在传播过程中,遇到不透明的物体,在物体的后面形成黑色区域即影子。光从一种均匀介质射向另一种介质表面上时,一部分光被反射回原介
Sound transmission Sound is generated by the vibration of the object, is vibrating sound object is called sound source. Sound transmission needs medium, solid, liquid, gas can sound, the vacuum can not sound, there is no air on the moon, so astronauts on the moon even close to talk by wireless phone. The spread of light itself can emit light called light source. We use light to show the path and direction of light. In fact, light is just a hypothetical model that does not exist. Light in a uniform medium is along a straight line, the light in the process of transmission, the encounter opaque objects in the back of the formation of black areas that shadow. When light is directed from one homogeneous medium to another medium surface, a portion of the light is reflected back to the original medium