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diff --git a/3875/CH10/EX10.21/10_21.sce b/3875/CH10/EX10.21/10_21.sce
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+clc;
+clear;
+KE=10*1.6*10^-19 //energy in J
+m=9.1*10^-31 //mass in kg
+h=6.63*10^-34 //Plancks constant in J-s
+m_h=2*10^-3 //molecular weight of hydrogen in kg
+a=6.023*10^23 //Avogadros constant in mol^-1
+v=2200 //velocity in m/s
+m_g=45*10^-3 //mass of golf ball in kg]
+v_g=22 //velocity of golf ball in m/s
+
+//calculation
+//case (a)
+lambda=(h/sqrt(2*m*KE))
+mprintf("The de-Broglie wavelength is = %1.3e m or 0.388 nm\n",lambda)
+
+//case (b)
+m=m_h/a //mass in kg
+lambda=(h/(m*v))
+mprintf("The de-Broglie wavelength is = %1.2e m or 0.988 nm\n",lambda) //The answer provided in the textbook is wrong.
+
+//case (c)
+lambda1=h/(m_g*v_g)
+mprintf("The de-Broglie wavelength of the golf ball is = %1.1e m",lambda1)