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diff --git a/374/CH6/EX6.7/67.sci b/374/CH6/EX6.7/67.sci
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+//chapter 6 example 7//
+clc
+clear
+//charge of electron=e,diode current=Id,plancks constant=h,effeciency=n,wavelength=l,area=A,noise equivalent power=NEP,directivity=D//
+h=6.62*(10^-34);
+c=3*(10^8);//in mts per sec//
+e=1.6*(10^-19);//charge of the electron//
+l=1.2*(10^-6);//in mts//
+Id=10*(10^-9);//in amperes//
+n=0.6;
+NEP=((h*c*sqrt(2*e*Id))/(n*e*l))*(10^14);
+printf("\n noise equivalent power=%f*(10^-14) W\n",NEP)
+A=100*50*(10^-12);
+D=(A^0.5)/(NEP*(10^-14));
+printf("\n directivity=%f mHz1/2W-1\n",D)