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diff --git a/1694/CH2/EX2.42/EX2_42.sce b/1694/CH2/EX2.42/EX2_42.sce
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+clear;
+clc;
+printf("\nEx2.42\n");
+//page no.-87
+//given
+theta=90;................//angle in degrees
+h=6.62*10^-34;..........//planck's constant in J-sec
+m=9.1*10^-31;.........//mass of electron 
+c=3*10^8;..............//speed of light in m/s
+e=1.6*10^-19;..........//charge
+lambda=10^-10;........//wavelength in m
+//acc. to compton exp.,_lambda-lambda=(h*(1-cosd(theta)))/m*c
+
+del_lambda=((h*(1-cosd(theta)))/(m*c)).........//compton shift in m
+
+K=(h*c*del_lambda)/(lambda*(lambda+del_lambda))......//energy in joule
+
+printf("\nKinetic energy of recoil electron is 4.72*10^-17 joule\n");