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+//Ex1_7
+
+clc;
+
+//Given:
+
+E=5.12*1.6*10^-19// energy in J
+h=6.626*10^-34;
+c=3*10^8;
+wavelength=200*10^-9;
+w=2.3;// in eV
+
+//solution:
+
+tf=E/h;// (part a)
+printf("\n The threshold frequency in s^-1 is = %f ",tf)
+
+tl=c/tf*10^10;// (part b)
+printf("\n The threshold wavelength in Angstroms is = %f ",tl)
+
+e=(h*c)/(wavelength*1.6*10^-19)// photon energy in eV (part c)
+
+pe=e-w;
+
+printf("\n The energy of photoelectrone in eV is = %f ",pe)