6 files changed, 86 insertions, 0 deletions
diff --git a/3850/CH42/EX42.1/Ex42_1.sce b/3850/CH42/EX42.1/Ex42_1.sce
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index 000000000..ef09868e2
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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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index 000000000..a3302656f
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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
diff --git a/3850/CH42/EX42.2/Ex42_2.sce b/3850/CH42/EX42.2/Ex42_2.sce
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index 000000000..2252497b5
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+
+//To Find the Maximum Wavelength of Light that can cause Photooelectric Effect in Lithium
+
+//Example 42.2
+
+clear;
+
+clc;
+
+h=4.14*10^-15;//Plank's Constant in eV-s
+
+c=3*10^8;//Speed of Light in m/s
+
+phi=2.5;//Work Function of Lithium in eV
+
+l=h*c/phi;//Threshold Wavelength in metres
+
+printf("Maximum Wavelength of Light to cause Photoelectric Effect in Lithium = %.0f nm",l*10^9);
diff --git a/3850/CH42/EX42.2/Ex42_2.txt b/3850/CH42/EX42.2/Ex42_2.txt
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index 000000000..f8e738be2
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+
+ Maximum Wavelength of Light to cause Photoelectric Effect in Lithium = 497 nm
+\ No newline at end of file
diff --git a/3850/CH42/EX42.3/Ex42_3.sce b/3850/CH42/EX42.3/Ex42_3.sce
new file mode 100644
index 000000000..2e9712514
--- /dev/null
+++ b/3850/CH42/EX42.3/Ex42_3.sce
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+
+//To Calculate the Time required by the Electron to receive sufficent energy to come out of the metal
+
+//Example 42.3
+
+clear;
+
+clc;
+
+r=1.0*10^-9;//Radius of Circle in metres on the surface occupied by a single electron
+
+d=5.0;//Distance between Monochromatic Light source and Metal Surface in metres
+
+std=%pi*r^2/d^2;//Solid Angle subtended at the source by the Circular Area in sterdian
+
+P=1*10^-3;//Power of monochromatic light source in Watts
+
+E=std*P/(4*%pi);//Energy heading towards the Circular Area per second
+
+phi=2*1.6*10^-19;//Work Function of Metal in Joules
+
+t=phi/(E*3600);//Time required by the electron to recieve sufficient energy to cmome out of the metal in hours
+
+printf("Time required by the electron to recieve sufficient energy to come out of the metal =%.2f hours",t);
diff --git a/3850/CH42/EX42.3/Ex42_3.txt b/3850/CH42/EX42.3/Ex42_3.txt
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index 000000000..6d151ecbc
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+
+ Time required by the electron to recieve sufficient energy to come out of the metal =8.89 hours
+\ No newline at end of file