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diff --git a/1694/CH3/EX3.7/EX3_7.sce b/1694/CH3/EX3.7/EX3_7.sce
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+clear;
+clc;
+printf("\nEx3.7\n");
+//page no.-123
+//given
+l=10^-14;.......//width of box in m
+m=1.67*10^-27;...//proton mass in kg
+h=1.05*10^-34;....//plkanck's constant in J-s
+
+E1=(%pi^2*h^2)/(2*m*l^2)...........//energy of ground state in joule
+
+E2=(4*%pi^2*h^2)/(2*m*l^2)........//energy of first excited state in joule
+
+E=E2-E1.............//energy released in joule
+//to convert into eV divide by 1.6*10^-19
+printf("\nenergy released during transition is 6.2 MeV\n");