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Ch2: Planck-Einstein Energy Quantization Law

الكلية كلية التربية للعلوم الصرفة     القسم قسم الفيزياء     المرحلة 3
أستاذ المادة فؤاد عطية مجيد       13/11/2013 17:28:45
2.6 Planck-Einstein Energy Quantization Law

E=h v = hc/lambda

2.7 Photoelectric effect

The quantum nature of light had its origin in the theory of thermal radiation and was strongly reinforced by the discovery of the photoelectric effect.
In figure 2.1, a glass tube contains two electrodes of the same material, one of which is irradiated by light. The electrodes are connected to a battery and a sensitive current detector measures the current flow between them.
The current flow is a direct measure of the rate of emission of electrons from the irradiated electrode.

2.8 Compton effect
A phenomenon called Compton scattering, first observed in 1924 by Compton, provides additional direct confirmation of the quantum nature of electromagnetic radiation. When X-rays impinges on matter, some of the radiation is scattered, just as the visible light falling on a rough surface undergoes diffuse reflection. Observation shows that some of the scattered radiation has smaller frequency and longer wavelength than the incident radiation, and that the change in wavelength depends on the angle through which the radiation is scattered. Specifically, if the scattered radiation emerges at an angle ? with the respect to the incident direction, and if and are the wavelength of the incident and scattered radiation, respectively, it is found that


المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .