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+clc
+//Chapter5
+//Ex_11
+//Given
+//part(a)
+h=6.63*10^-34 //in Js
+c=3*10^8 // in m/s
+e=1.6*10^-19 // in coulombs
+ue=0.034 //in m2/V/s
+uh=0.0018 //in m2/V/s
+t=1*10^-3 // in seconds
+L=1*10^-3 //in m
+D=0.1*10^-3 //in m
+W=1*10^-3 //in m
+I=1// mW/cm^2
+I=I*10^-3*10^4 // conversion of units to W/m^2
+n=1 //quantum efficiency
+lambda=450*10^-9 // in m
+V=50 // in volts
+//part(a)
+A=L*W //in m3
+EHP_ph=(A*n*I*lambda)/(h*c)
+disp(EHP_ph,"No.of EHP/s generated per second is")
+//part(b)
+delta_sigma=e*n*I*lambda*t*(ue+uh)/(h*c*D)
+disp(delta_sigma,"Photo conductivity of the sample in ohm^-1 m^-1 is")
+//part(c)
+A=0.1*10^-6 //m2
+E=V/W
+delta_J=E*delta_sigma
+delta_I=A*delta_J
+disp(delta_I*10^3,"Photocurrent produced in mA is")