| Date 08/09/2010 |
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| Script S6_2_5.m | |||
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%==============================================
%photons 2 %============================================== % %standard constants c=2.998e008; h=6.626e-034; e=1.6e-19; %power of the sources P=400; %wavelengths of the sources lambdaV=0.4e-06; lambdaR=0.7e-06; %constants and preliminary calculi cost=h*c; costeV=cost/e; % num=P*lambda; numV=P*lambdaV; numR=P*lambdaR; % N=num/cost; %numbers of photons and their difference NV=P*lambdaV/cost NR=P*lambdaR/cost diff=NR-NV %a sphere of radius r in m and its area R=2; rq=R*R; S=4*pi*rq; %intensities as number of photons per sec and per square meter IV=NV/S IR=NR/S %intensities as watt/(square meter) IIV=IV*cost/lambdaV IIR=IR*cost/lambdaR %============================================== % %============================================== %============================================== %Corrigenda %lambdaR isn't 400 nm but 700 nm (Sec. 6.2.5, %pag. 253 at the second row of the question of %the problem "Photons 2") %============================================== %============================================== |
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