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+// Example 2.4
+//computation of (A) minimum speed of electron travelling (B) minimum frequency of photon//
+// Page no. 47
+
+clc;
+clear;
+close;
+
+//Given data
+ip=21.5;//ionization potential of neon
+e=1.602*10^-19;
+m=9.109*10^-31;
+v_freespace=2.998*10^8;//velocity of light in free space
+planck_const=6.63*10^-34;
+
+
+//..................................(A)......................................//
+
+//Calculation for velocity of the electron//
+v=sqrt((2*ip*e)/m);
+
+//..................................(B)......................................//
+
+//Calculation for wavelength of a photon with energy equal to the ionization potential//
+lambda=12400/ip;
+
+//Calculation for frequency of the photon//
+f=v_freespace/(lambda*10^-10);
+
+//Calculation for frequency of the photon using alternate method//
+f1=(ip*e)/planck_const;
+
+
+//Displaying the result in command window
+printf('\n Velocity of the electron = %0.2f x 10^6 m/sec',v*10^-6);
+printf('\n \n Wavelength of a photon with energy equal to the ionization potential = %0.2f A',lambda);
+printf('\n \n Frequency of the photon = %0.1f x 10^15 Hz',f*10^-15);
+
+
+
+
+
+