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diff --git a/2780/CH1/EX1.27/Ex1_27.sce b/2780/CH1/EX1.27/Ex1_27.sce
new file mode 100755
index 000000000..9ae6765c6
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+++ b/2780/CH1/EX1.27/Ex1_27.sce
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+clc
+//to calculate speed of 0.1MeV electron
+E=0.512*10^6 //rest mass energy E=m0*c^2
+c=3*10^8 //velocity of light (m/s)
+K=0.1*10^6 //kinetic energy (MeV)
+v=c*sqrt(1-(E/(K+E))^2) 
+disp("speed of electron is v="+string(v)+"m/s" )
+//to calculate mass and speed of 2MeV electron
+E=2*10^6*1.6*10^-19 //in (J)
+m=E/c^2 
+disp("mass is m="+string(m)+"kg")
+m0=9.11*10^-31 //electron mass (kg)
+v=c*sqrt(1-m0^2/m^2)
+disp("speed is v="+string(v)+"m/s")
+
+