Atomic Physics

Jun 17th, 2015
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Introduction: Modern atomic and nuclear physics is among the most impressive scientific achievements of the last century. Both the theories and techniques of atomic and nuclear physics have played an important role in the life

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Work energy and powerIn general work is said to done when a body moves in a certain distance when force is applied to thatbody.Work:The work done by a force acting on the body is defined as the product of the force and the displacementof the body in the direction of the force.Constant Force :If the force is constant and it displaces the body through a distance (s) in the same direction, then workdone.W=FaBut if the displacementmakes an anglethe direction of force; thenwithConstant forcecomponent of displacement along the direction of force =so,work done by the force ,W=Fsi.e. the work done by a force is the scalar product of the force vector and displacement vector.2. Variable Force :If the force is variable, then for infinitely small displacement, the force is assumed constant, so the workdone during small displacementd W = F dx (one dimensional form)Then total work is joined by adding such small amounts of workThis is found in two ways :(i) By integration :Let body be displaced fromAndGraph of integration(ii) By graphical method :If a graph is plotted between force F and displacement x, then work done by the force from= Area enclosed by F x curve and x-axis from= area of shaded portion.Unit of work in M.K.S. and S.I. system is joule.Dimensions of work= [ F ] [s] = [] [L] = []In C.G.S system the unit of work is ergSometimes the unit of work is written as kilogram-metre1 kilogram-metre= g joule = 9.8 jouleRemark

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