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//Variable declaration:
Q = 5.0 //Radiation heat transfer (W)
E = 1.0 //Emissivity of filament
s = 5.669*10**-8 //Stefan-Boltzmann constant
T1 = 900.0+273.0 //Light bulb temperature (K)
T2 = 150.0+273.0 //Glass bulb temperature (K)
//Calculation:
A = Q/(E*s*(T1**4-T2**4)) //Surface area of the filament (m^2)
//Result:
printf("The surface area of the filament is : %.2f cm^2",A*10**4)
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