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+//chapter 5
+//example 5.21
+//Calculate uncertainty in the energy of the photon 
+//page 111
+clear;
+clc;
+//given
+dt=1E-12; // in sec (average life time)
+h=6.63E-34; // in J-s (Planck'c constant)
+pi=3.14; // value of pi used in the solution
+e=1.6*1E-19; // in C (charge of electron)
+//calculate
+// Since dE*dt>=h/(4*pi)  (uncertainty relation for energy)
+dE=h/(4*pi*dt); // calculation of minimum uncertainty in the energy
+printf('\nThe uncertainty in the energy of the photon is \tdE=%1.2E J',dE);
+dE=dE/e; //changing unit from J to eV
+printf('\n\t\t\t\t\t\t  =%1.1E eV',dE);