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//Variable declaration:
syms l //Wavelength (mu.m)
I = 40*exp(-l**2) //Intensity of radiation (Btu/h.ft^2.mu.m)
//Calculation:
E = eval(integrate(I, l,0,%inf)) //Total emissive power (Btu/h.ft^2)
//Result:
printf("The total emissive power is : %.1f Btu/h.ft^2.",E)
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