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diff --git a/1694/CH2/EX2.48/EX2_48.sce b/1694/CH2/EX2.48/EX2_48.sce
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+clear;
+clc;
+printf("\nEx2.48\n");
+//page no.-91
+//given
+lambda=5.4*10^-5;.............//wavelength in cm
+c=3*10^10;..................//speed of light in cm/sec
+h=6.62*10^-27;........//planck's constant in ergs-sec
+e=1.6*10^-12;.........//charge in ergs
+w=1.2;.........//work function in eV
+eo=4.8*10^-10;.........//charge in e.s.u.
+
+E=(h*c)/(lambda*e).............//energy of one quantum of light in eV
+
+//AS V*e=E-w
+
+V=((E-w)*e*300)/eo...................//potential diff. in volts
+
+printf("\nretarding potential is 1.09 volts\n");