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Unformatted text preview: 10/31/07 PHYS 101-20 The Photoelectric Effect and the Particle Nature of Light Objective : To determine the energy of ejected electrons from an atom when photons are applied to that atom by measuring the stopping potential of the ejected electrons. Physicists in the early 20 th century had begun to realize that Newtons laws did not always apply when dealing with atoms or other objects small in size. These scientists determined that physical quantities were not continuous, but came in defined, discrete amounts called quanta. It was then conjectured that light, the most basic form of energy, was also delivered in the form of quanta and must be made up of it, which are called photons, and behave just like particles. The process called the Photoelectric Effect, an experiment designed by Albert Einstein, determined that when light is directed onto an atom, it gives energy to the electrons that orbit the nucleus, and when they receive enough energy, the electrons are ejected from the atom. Only a certain discrete amount of energy cause electrons to be ejected from the atom....
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