How Do You Solve a Leslie Cube Assignment?

[jaidon]

sorry, this was my question from yesturday, and now my assignment is due tomorrow. anyone have any help for me?


A Leslie cube has a surface temp of 97C. One of its four side faces has an area of 100 cm^2 and is painted black. Calculate:

a) the wavelength at which the spectral intensity (per unit wavelength) is a maximum

b)the total intensity (all wavelengths) of the emitted radiation just outside the surface

C) the total power emitted by the black surface

for a) i used lambda=2.9*10^-3/T (not sure if this is the correct way of doing it)

for b) i wanted to use Stefan's Law but this seems to simple

for c) i multiplied the answer from b) by the area of the four sides.

does any of this sound correct? i seem to be struggling on this topic

also, in Planck's energy density equation, what exactly is the spectral energy density? is it also known as anything else? thanks.

 

[dextercioby]

You did the problem wery well,all three points of it...

The volumic spectral energy density (given by Planck's law) has the significance of the thermal radiation/unit of volume in one domain/interval of frequency chosen equal to unity...

Daniel.

 

[dextercioby]

One more thing to point a) of the problem.I sincerely hope u converted the Celsius degrees into Kelvin ones...

Daniel.

 

[jaidon]

thanks for your input on this. glad to here i did it correctly, and of course i converted to kelvin, thanks for the heads up though