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+//Chapter 4, Exmaple 1, page 139
+//Claculate alpha and No. of electrons emmited
+clc
+clear
+//Claculate (a)alpha
+d2 = 0.01
+d1 = 0.005
+I2 = 2.7*10**-7
+I1 = 2.7*10**-8
+alpha = 1/(d2-d1)*log(I2/I1)
+//(b)number of electrons emmited from cathode per second
+I0 = I1*%e**(-alpha*d1)
+n0 = I0/(1.6*10**-19)
+printf("\n Part (a)\n alpha = %f m^-1",alpha)
+printf("\n Part (b)\n I0 = %e ",I0)
+printf("\n No of electrons emitted = %e electrons/s",n0)
+//Answer may vary due to round off error