1 files changed, 22 insertions, 0 deletions
diff --git a/3755/CH2/EX2.21/Ex2_21.sce b/3755/CH2/EX2.21/Ex2_21.sce
new file mode 100644
index 000000000..dd20d6a71
--- /dev/null
+++ b/3755/CH2/EX2.21/Ex2_21.sce
@@ -0,0 +1,22 @@
+clear
+//
+//
+//
+
+//Variable declaration    
+a1=5.43*10^-8;    //lattice constant(cm)
+M1=28.1;         //atomic weight
+N=6.023*10^23;      //avagadro number
+n1=8;     //number of atoms
+a2=5.65*10^-8;    //lattice constant(cm)
+M2=144.6;         //atomic weight
+n2=4;     //number of atoms
+
+//Calculations
+rho1=n1*M1/(N*a1^3);    //density of Si(gm/cm^3)
+rho2=n2*M2/(N*a2^3);    //density of GaAs(gm/cm^3)
+
+//Result"
+printf("\n density of Si is %0.2f gm/cm^3",rho1)
+printf("\n density of GaAs is %0.3f gm/cm^3",rho2)
+printf("\n answer in the book varies due to rounding off errors")