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diff --git a/752/CH4/EX4.19.1/4_19_1.sce b/752/CH4/EX4.19.1/4_19_1.sce
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+clc;
+// page no 146
+// prob no 4_19_1
+//An avalanche diode source is given with excess noise ratio is 14 dB
+enr=14;
+To=290;//Room temp in K
+y=9;//Y-factor  is 9 dB
+//converting dB in power ratio
+ENR=10^(enr/10);
+Y=10^(y/10);
+//From def of ENR the hot temp is
+Th=To*(ENR+1);
+disp('K',Th,'The value of hot temp Th is '); 
+//Determination of equivalent noise temp
+Te=(Th-(Y*To))/(Y-1);
+disp('K',Te,'The value of equivalent noise temp Te is '); 
+\ No newline at end of file