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diff --git a/1172/CH9/EX9.2.2/9_2b.txt b/1172/CH9/EX9.2.2/9_2b.txt
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+ # Problem 2b # 
+Standard formula used 
+	 M = m - 2.5log(L/L_0) 
+ Capella is  155.688334 times brighter than sun.
diff --git a/1172/CH9/EX9.2.2/Example9_2b.sce b/1172/CH9/EX9.2.2/Example9_2b.sce
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+++ b/1172/CH9/EX9.2.2/Example9_2b.sce
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+clc
+// given that
+m_capella = 0.05 // magnitude of brightness of capella at 14 parsecs
+m_sun = 4.8 // absolute magnitude of brightness of sun
+d = 14 // distance of capella in parsecs
+D = 10 // distance of capella considerd for observation
+// sample problem 2b page No. 333
+printf("\n # Problem 2a # \n")
+
+printf("Standard formula used \n\t M = m - 2.5log(L/L_0) ")
+M_capella = m_capella - 5*log10(d/D) // calculation of absolute magnitude of brightness at distance of 10 parsecs
+del_m = m_sun - M_capella // difference between absolute magnitude of sun and capella
+ratio = 10^(del_m/2.5) 
+printf ("\n Capella is  %f times brighter than sun.", ratio )