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diff --git a/3869/CH6/EX6.22/Ex6_22.sce b/3869/CH6/EX6.22/Ex6_22.sce
new file mode 100644
index 000000000..1e605132a
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+++ b/3869/CH6/EX6.22/Ex6_22.sce
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+clear
+//
+//
+//
+
+//Variable declaration
+h=1
+k=1
+l=1                     //miller indices
+n=4
+A=107.87                //atomic weight(amu)
+N=10500*6.052*10**26    //density(kg/m**3)
+theta=(19+(12/60))*%pi/180      //angle(radian)
+r=1.278*10**-10         //radius(m)
+hp=6.625*10**-34        //plancks constant(Js)
+c=3*10**8               //velocity of light(m/sec)
+e=1.6*10**-19           //charge of electron(coulomb)
+
+//Calculation
+a=(n*A/N)**(1/3)        //lattice constant(m)
+d=a/sqrt(h**2+k**2+l**2)          //interplanar spacing(m)
+lamda=2*d*sin(theta)       //wavelength of X-rays(m)
+E=hp*c/(e*lamda)                    //energy of X-rays(eV) 
+
+//Result
+printf("\n wavelength of X-rays is %0.3f  angstrom",lamda*10**10)
+printf("\n answer in the book varies due to rounding off errors")
+printf("\n energy of X-rays is %0.0f  *10**3 eV",E/10**3)