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diff --git a/1694/CH2/EX2.43/EX2_43.sce b/1694/CH2/EX2.43/EX2_43.sce
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+clear;
+clc;
+printf("\nEx2.43\n");
+//page no.-88
+//given
+h=6.624*10^-27;..........//planck's constant in ergs-sec
+m=9.1*10^-28;.........//mass of electron in kg
+w=3.2*10^-12;.........//work function in joule
+c=3*10^10;...........//speed of light in cm/sec
+lambda=3600*10^-8;...//wavelength in m
+e=1.6*10^-12;.........//charge in ergs
+
+lambda_o=(h*c)/w;..........//threshold wavelength in cm
+
+vo=c/lambda_o;........//threshold frequency in m/s
+
+v=c/lambda;..........//frequency
+
+E=((v-vo)*h)/e.................//energy in eV
+
+printf("\nkinetic energy is 1.45 eV\n");
+
+printf("\nso stopping potential is 1.45 eV\n");
+
+v=sqrt((2*E*e)/m)............//velocity of electron in cm/sec
+
+printf("\nVelocity of electron is 7.1*10^7 cm/sec\n");  
+