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1.光压 1905年,爱因斯坦提出,在空间传播的光不是 连续的,而是一份一份的,每一份叫做一个光量子, 简称光子。光子的能量E跟光的频率v成正比,即 E=hv,h是普朗克常量,这个学说后来叫做光子说。 根据量子理论,光子具有动量,光子的动量P 和光子的能量E之间的关系为p=E/c,c为光速。光 照到物体表面时,会对物体产生压强,这就是“光 压”。光压是光的粒子性的典型表现。光压的产生机 理如同气体压强:由大量气体分子与器壁的频繁碰 撞产生了持续均匀的压力,器壁在单位面积上受的 压力数位上等于气体的压强。
1. Light pressure 1905, Einstein proposed that the light is not transmitted in space, but a copy of each one is called a light quantum, referred to as photons. The energy of a photon, E, is proportional to the frequency, v, of the light, E = hv, where h is the Planck’s constant, which was later called photon. According to the quantum theory, the photon has a momentum, and the relationship between the photon’s momentum P and the photon’s energy E is p = E / c, where c is the speed of light. Light shines on the surface of the object, it will produce pressure on the object, which is “light pressure ”. Light pressure is a typical manifestation of light particleity. The mechanism of light pressure is the same as the gas pressure. The frequent pressure collision between a large number of gas molecules and the wall produces a constant pressure. The wall pressure per unit area is equal to the pressure of gas.