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+// Example 5.25
+// Computation of (a) quantum efficiency and (b) resposivity
+// page no 487
+
+clc;
+clear;
+close;
+
+//Given data
+nh=1.5*10^12;                 // No. of hole pairs generated
+np=2.5*10^12;                 // No. of incident photons
+lambda=0.85*10^-6;            // Wavelength of laser source 
+c=3*10^8;                     // Speed of light
+h=6.62*10^-34                 // Planck constant
+e1=1.6*10^-19;                // Electronic charge
+
+// (a)  Quantum efficiency
+e=nh/np;                            
+
+// (b) Responsivity
+R=e*(lambda*e1)/(h*c);                       //
+
+//Display result on command window
+printf("\n Quantum efficiency = %0.1f  ",e);
+printf("\n Responsivity R (A/W) = %0.3f  ",R);