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diff --git a/1694/CH3/EX3.1/EX3_1.sce b/1694/CH3/EX3.1/EX3_1.sce
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+clear;
+clc;
+printf("\nEx3.1\n");
+//page no.-120
+//given
+h=6.63*10^-27;........//planck's constant
+l=10^-8;..............//length of each side of cube in m
+m=9.11*10^-20;.......//mass of electron
+
+p1=h*3^(0.5)/2*l..........//momentum on ground state in gm*cm/sec
+
+E1=(h^(2)*3)/(8*m*l^(2)).........//energy for ground state in ergs
+
+printf("\nmomentum & energy for ground state is 5.74*10^-19 gm*cm/sec and 113eV\n");
+
+//for first excited state quantum no. is 2
+p2=h*6^(0.5)/2*l.............//momentum on first excited state in gm*cm/sec
+
+E2=(h^(2)*6)/(8*m*l^(2))........//energy for first excited state in ergs
+
+printf("\nmomentum and energy for first excited state are 8.13*10^-19 gm*cm/sec and 362*10^-12 erg\n");