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+
+
+//page no. 31
+//Example no 1-17
+clc;
+clear all;
+disp('Solution (i) is ');
+l=0.045;//wavelength in nm
+h=6.63*10^-34;      //planks constant in J/s
+c=3*10^8;        //speed of light in m/s
+E=h*c/l/10^-9;    //energy of photon in eV
+mprintf("\n E = %e J",E);
+E1=E/(1.6*10^-19);    // energy in joule
+mprintf("\n E = %e eV",E1);
+e=1.6*10^-19;    // charge of electron
+disp('Solution (ii) is ');
+V=E/e;
+printf("\n Required voltage is = %0.2f KV",V/1000);// result
+
+// Value of wavelenght in problem is .45 but in the solution is .045 
+//the value considered above is .045
+