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clear
clc
disp('Exa-2.15');
r=1.5*10^11; I=1.4*10^3; //radius and intensity of sun
s=4*%pi*r^2 //surface area of the sun
Pr=s*I // Power radiated in J/sec
c=3*10^8; //velocity of light
m=Pr/c^2 //rate od decrease of mass
printf('The rate of decrease in mass of the sun is %.1e kg/sec.',m);
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