initial commit / add all books

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diff --git a/3875/CH10/EX10.9/10_9.sce b/3875/CH10/EX10.9/10_9.sce
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+clc;

+clear;

+h=6.63*10^-34 //Plancks constant in Joule-s

+c=3*10^8 //velocity of light in m/s

+lambda1=10^-3 //wavelength in m

+lambda2=100*10^-9 //wavelength in m

+T=1000 //temperature in K

+k_B=1.38*10^-23 //Boltzmann constant in m^2 kg s^-2 K^-1

+d_lambda1=0.1*10^-3 //range of wavelength in m

+d_lambda2=1*10^-9 //range of wavelength in m

+

+//calculation

+//case (a) when the range of wavelength is between 1-1.1 mm

+E=exp((h*c)/(lambda1*k_B*T)) //calculating the exponential term of the eqn

+U_lambda1=((8*%pi*h*c*d_lambda1)/(lambda1^5*(E-1)))

+mprintf("The energy density is = %1.2e J/m^3.\n",U_lambda1)

+

+//case (b) when the range of wavelength is between 100-101 nm

+E1=exp((h*c)/(lambda2*k_B*T)) //calculating the exponential term of the eqn

+U_lambda2=((8*%pi*h*c*d_lambda2)/(lambda2^5*(E1-1)))

+mprintf("The energy density is = %1.2e J/m^3.",U_lambda2)

+//The answer provided in the textbook is wrong.

+

+mprintf("\nThus for shorter wavelengths the energy densities predicted by Rayleigh-Jeans law and Planks law are considerably different while for longer wavelengths the energy densites predicted are same.")

diff --git a/3875/CH10/EX10.9/10_9.txt b/3875/CH10/EX10.9/10_9.txt
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+The energy density is = 3.44e-11 J/m^3.

+The energy density is = 1.27e-60 J/m^3.

+Thus for shorter wavelengths the energy densities predicted by Rayleigh-Jeans law and Planks law are considerably different while for longer wavelengths the energy densites predicted are same.
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