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Date 08/09/2010
Script S6_2_7.m
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%==============================================
%einstein 2
%Title of the Sec. 6.2.7 isn't Photons 4
%but Einstein 2
%==============================================
%
%first and second wavelengths in microns
lambda1=0.3;
lambda2=0.4;
%light speed in vacuum
c=2.998e+08;
%first and second stopping potential
E1=1.85;
E2=0.82;
%preliminary calculi
N1=lambda1*E1;
N2=lambda2*E2;
D=lambda2-lambda1;
%the work function
W0=(N1-N2)/D
%preliminary calculi
cost=1.0e-06;
fact1=lambda1*cost/c;
fact2=W0+E1;
%the Planck constant in eVsec
h=fact1*fact2
%==============================================
%
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