PCS 125 Chapter Notes - Chapter 12: Impact Parameter, Centripetal Force, Hydrogen Spectral Series
3 Aug 2018
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Physics notes for class 12 chapter 12 atoms. All elements are consists of very small invisible particles, called atoms. Atoms of same element are exactly same and atoms of different element are different. Every atom is uniformly positive charged sphere of radius of the order of 10-10 m, in which entire mass is uniformly distributed and negative charged electrons are embedded randomly. Limitations of thomson"s atomic model: it could not explain the origin of spectral series of hydrogen and other atoms, it could not explain large angle scattering of particles. Distance of closest approach ro = 1 / 4 o . 2ze2 / ek where, ek = kinetic energy of the cc-particle. The perpendicular distance of the velocity vector of a-particle from the central line of the nucleus, when the particle is far away from the nucleus is called impact parameter.
