Modern Physics The particle behavior of light is proven by the - TopicsExpress

Modern Physics The particle behavior of light is proven by the photoelectric effect. A photon is a particle of light {wave packet}. Large objects have very short wavelengths when moving and thus can not be observed behaving as a wave. (DeBroglie Waves) All electromagnetic waves originate from accelerating charged particles. The frequency of a light wave determines its energy (E = hf). The lowest energy state of a atom is called the ground state. Increasing light frequency increases the kinetic energy of the emitted photo-electrons. As the threshold frequency increase for a photo-cell (photo emissive material) the work function also increases. Increasing light intensity increases the number of emitted photo-electrons but not their KE.

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