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diff --git a/2681/CH8/EX8.11/Ex8_11.sce b/2681/CH8/EX8.11/Ex8_11.sce
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+//half power radiation pattern and beamwidth between first null
+//given
+clc
+Da=12//metre
+f=10d+9//hertz
+v=3d+8//m/s
+lemda=v/f//metre
+ie=0.6//illumination efficiency
+gp=ie*(Da/lemda)^2//gain pattern
+gp_decibles=10*log10(gp)//changing to db
+gp_decibles=round(gp_decibles*100)/100///rounding off decimals
+disp(gp_decibles,'the power gain in decibles')//degree,db