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diff --git a/3850/CH42/EX42.1/Ex42_1.sce b/3850/CH42/EX42.1/Ex42_1.sce
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+
+//To Calculate the Energy  and linear Momentum and number of photons
+
+//Example 42.1
+
+clear;
+
+clc;
+
+h=4.14*10^-15;//Plank's Constant in eV-s
+
+c=3*10^8;//Speed of Light in m/s
+
+l=600*10^-9;//Wavelength of Light in metres
+
+E=h*c/l;//Energy of each photon in eV
+ 
+printf("(a) Energy of each photon = %.2f eV",E);
+ 
+p=E/c;//Linear Momentum of each photon in eV-s/m
+
+printf("\n     Linear Momentum of each photon = %.2f*10^-8 eV-s/m",p*10^8);
+
+A=1*10^-4;//Area of cross section in m^2
+
+e=1.6*10^-19;//Charge on an electron
+
+I=100;//Intensity of light in W/m^2
+
+t=1;//Duration for which beam passes in seconds
+
+E1=I*A*t;//Energy crossing 1 cm^2 in 1 second
+
+n=E1/(E*e);//Number of photons crossing 1 cm^2 in 1 second
+
+printf("\n (b) Number of photons crossing 1 cm^2 in 1 second = %.1f*10^16",n*10^-16);
diff --git a/3850/CH42/EX42.1/Ex42_1.txt b/3850/CH42/EX42.1/Ex42_1.txt
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+
+ (a) Energy of each photon = 2.07 eV
+     Linear Momentum of each photon = 0.69*10^-8 eV-s/m
+ (b) Number of photons crossing 1 cm^2 in 1 second = 3.0*10^16
+\ No newline at end of file