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diff --git a/3875/CH12/EX12.1/Ex12_1.sce b/3875/CH12/EX12.1/Ex12_1.sce
new file mode 100644
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+++ b/3875/CH12/EX12.1/Ex12_1.sce
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+clc;
+clear;
+m=1.67*10^-27 //mass of particle in kPP
+L=0.1*10^-9 //width in nm
+n=3 //quantum number
+h=6.63*10^-34 //Plancks constant in J-s
+
+//calculation
+//(1)
+E=(n^2*h^2)/(8*m*L^2) 
+mprintf("The energy of the particle is = %2.2e Joules\n",E)
+//The answer provided in the textbook is wrong.
+
+//(2)
+lambda=(2*L)/n
+p=h/lambda
+mprintf("The momentum of the particle is = %1.2e kg-ms^-1\n",p)
+
+//(3)
+P=((1/L)*(L/3)) //after integration
+mprintf("The probability of finding particle between x=0 and x=L/3 is = %f",P)