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diff --git a/1787/CH3/EX3.3/Exa3_3.sce b/1787/CH3/EX3.3/Exa3_3.sce
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index 000000000..7e7b046bb
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+//Exa 3.3
+clc;
+clear;
+close;
+//given data
+Emax=2.5;//maximum energy of emitted electrons in eV 
+lambda=2537;//in Angstrum
+EeV=12400/lambda;//in eV
+disp(EeV,"The eV equivalent of the energy of incident photon : ");
+phi=EeV-Emax;//in eV
+disp(phi,"Work function of the cathode material is ");
+\ No newline at end of file