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diff --git a/2780/CH1/EX1.12/Ex1_12.sce b/2780/CH1/EX1.12/Ex1_12.sce
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+clc
+//to calculate velocity of beta particle
+c=3*10^8 //light velocity(m/s)
+u1=0.9*c //velocity of the beta particle relative to the atom in the direction of motion
+v=0.25*c //velocity of the radioactive atom relative to an experimenter
+u=(u1+v)/(1+u1*v/c^2)  
+disp(" velocity of the beta particle as observed by the experimenter is u="+string(u)+"m/s")
+//answer is given in terms of c in the book =0.94c