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+// example:-11.1,page no.-589.
+// program to determine the equivalent noise temperature of the amplifier.
+T1=290;P1=-62;G=100;B=10^9;k=1.38*10^-23;
+T2=77;P2=-64.7;Ts=450;
+Y=P1-P2;  // Y-factor in db.
+Y=10^0.27;
+Te=(T1-Y*T2)/(Y-1);
+Po=G*k*B*(Ts+Te);
+Po=10*log10(Po/0.001); /// converting in to dBm.
+disp(Te,'the equivalent noise temperature in kelwin = ')
+disp(Po,'the total noise power out of the amplifier in dBm will be = ')
+\ No newline at end of file