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diff --git a/1694/CH2/EX2.20/EX2_20.sce b/1694/CH2/EX2.20/EX2_20.sce
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+++ b/1694/CH2/EX2.20/EX2_20.sce
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+clear;
+clc;
+printf("\nEx2.20\n");
+//page no.-66
+//given
+d=10^-14;..................//width of special line in m
+lambda=6*10^-7;.............//wavelength in m
+c=3*10^8;....................//speed of light in m/s
+
+//as E=(h*c*d)/lambda^2,  put in uncertainty relation ,E*t=h/2*%pi
+
+t=lambda^2/(2*%pi*c*d).................//time required in sec
+
+printf("\ntime required is 1.9*10^-8 sec\n");