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diff --git a/1271/CH15/EX15.20/20.txt b/1271/CH15/EX15.20/20.txt
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+ # PROBLEM 20 # 
+Standard formula used 
+ E = (n^2 * h^2) / (8 * m * L^2)) 
+ p_n = n*h/(2*pi) 
+
+ Energy Eigen value of electron -
+ For (n=1) is 6.019835e-18 J.
+ For (n=2) is 2.407934e-17 J.
+ For (n=3) is 5.417852e-17 J. 
+de-Broglie wavelength of electron -
+ For (n=1) is 2.000000 A.
+ For (n=2) is 1.000000 A. 
+ For (n=3) is 0.666667 A
diff --git a/1271/CH15/EX15.20/example15_20.sce b/1271/CH15/EX15.20/example15_20.sce
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+clc 
+// Given that
+l = 1e-10 // length of box in m
+m = 9.1e-31 // mass of electron in kg
+c = 3e8 // speed of light in m/sec
+h = 6.62e-34 // Planck constant in J-sec
+// Sample Problem 20 on page no. 15.32
+printf("\n # PROBLEM 20 # \n")
+printf("Standard formula used \n")
+printf(" E = (n^2 * h^2) / (8 * m * L^2)) \n p_n = n*h/(2*pi) \n")
+n = 1 // for n=1
+E1 = (n^2 * h^2) / (8 * m * l^2)
+lambda1 =2*l
+n = 2 // for n=2
+E2 = (n^2 * h^2) / (8 * m * l^2)
+lambda2 =2*l/2
+n = 3 // for n=3
+E3 = (n^2 * h^2) / (8 * m * l^2)
+lambda3 =2*l/3
+printf("\n Energy Eigen value of electron -\n For (n=1) is %e J.\n For (n=2) is %e J.\n For (n=3) is %e J. \nde-Broglie wavelength of electron -\n For (n=1) is %f A.\n For (n=2) is %f A. \n For (n=3) is %f A",E1,E2,E3,lambda1*1e10,lambda2*1e10,lambda3*1e10)