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+//Example 29.1
+lambda=420*10^-9;//Wavelength of violet light (m)
+c=3*10^8;//Speed of light (m/s)
+h=6.63*10^-34;//Planck's constant (J.s)
+f=c/lambda;//Frequency (Hz)
+E=h*f;//Energy (J)
+printf('a.Photon energy = %0.2e J',E)
+E=E*1/(1.6*10^-19);//Energy (eV)
+printf('\n  Photon energy = %0.2f eV',E)
+BE=2.71;//Binding energy (eV)
+KE_e=E-BE;//Maximum kinetic energy of electrons (eV)
+printf('\nb.Maximum kinetic energy of electrons = %0.3f eV',KE_e)
+//Answer varies from the textbook for (b.)
+//Openstax - College Physics
+//Download for free at http://cnx.org/content/col11406/latest