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+//ANALOG AND DIGITAL COMMUNICATION
+//BY Dr.SANJAY SHARMA
+//CHAPTER 6
+//NOISE
+clear all;
+clc;
+printf("EXAMPLE 6.2(PAGENO 281)");
+
+//given
+R_1  = 300//equivalent noise resistance
+R_2 = 400//input resistance
+T = 273+27//temperature in kelvin
+B = 7*10^6//bandwidth
+k = 1.38*10^-23//boltzman's constant
+
+//calculations
+R_s = R_1 +R_2//effective resistance in series
+V_nr = sqrt(4*k*T*B*R_s)//rms noise voltage
+
+//result 
+printf("\n\nRms noise voltage = %.10f V",V_nr)