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diff --git a/374/CH6/EX6.9/69.sci b/374/CH6/EX6.9/69.sci
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+++ b/374/CH6/EX6.9/69.sci
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+//chapter 6 example 9//
+clc
+clear
+//electron transit time=tf,bandwidth=Bm,photoconductive gain=G,//
+tf=8*(10^-12);//in seconds//
+G=60;
+Bm=(1/(2*%pi*tf*G))*(10^-8);
+printf("\n maximum 3dB bandwidth=%f MHz\n",Bm)
+\ No newline at end of file