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+clear;
+clc;
+printf("\nEx2.46\n");
+//page no.-90
+//given
+w=10.08*10^-12;...........//work function in ergs
+h=6.624*10^-27;...........//planck's constant in ergs-sec
+c=3*10^10;................//speed of light in cm/sec
+
+lambda_o=h*c/w............//threshold wavelength in cm
+
+printf("\nthreshold wavelength is 1972 angstrom\n");