initial commit / add all books

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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
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diff --git a/3850/CH42/EX42.2/Ex42_2.sce b/3850/CH42/EX42.2/Ex42_2.sce
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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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+
+ Maximum Wavelength of Light to cause Photoelectric Effect in Lithium = 497 nm
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diff --git a/3850/CH42/EX42.3/Ex42_3.sce b/3850/CH42/EX42.3/Ex42_3.sce
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index 000000000..2e9712514
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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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+
+ Time required by the electron to recieve sufficient energy to come out of the metal =8.89 hours
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