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diff --git a/1694/CH3/EX3.5/EX3_5.sce b/1694/CH3/EX3.5/EX3_5.sce
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+clear;
+clc;
+printf("\nEx3.5\n");
+//page no.-122
+//given
+h=6.63*10^-34;........//planck's constant in Js
+m=9.11*10^-31;........//mass of electron in kg
+l=2.5*10^-10;............//width of box in m
+n1=2;...................//quantum no. for second lowest state
+n2=3;...................//quantum no. for third lowest state
+e=1.6*10^19;...........//charge
+
+E1=(h^2)/(8*m*l^2*e)..........//first lowest quantum energy
+
+E2=(n1^2)*E1.............//second lowest quantum energy
+
+E3=(n2^2)*E1............//third lowest quantum energy
+
+printf("\nlowest permissible quantum energies are 6 eV,24 eV, 54 eV\n");