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+clc;
+// page no 144
+// prob no 4_18_1
+//A receiver with noise fig. 12dB fed by low noise amplr with gain  50 dB with noise temp of 90 k
+f=12;
+Tm=290;//Room temp value 
+T=90;
+g=50;
+//calculating power ratio
+F=10^(f/10);
+G=10^(g/10);
+//Determination of equivalent noise at room temp
+Tem=(F-1)*Tm;
+disp('K',Tem,'The value of equivalent noise at room temp is');
+//Determination of equivalent noise at 90 k temp
+Te=T+(Tem/G);
+disp('K',Te,'The value of equivalent noise at noise temp=90 is');
+\ No newline at end of file