I How to Show 25% of Cavity Radiant Energy Between 0 and Peak Wavelength?

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How to demonstrate that about 25% of the radiant energy in a cavity is concentrated between 0 and maximum energy wavelength?
How to demonstrate that about 25% of the radiant energy in a cavity is concentrated between 0 and maximum energy wavelength?
 
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Blackbody radiation?
By "maximum energy wavelength" you mean the wavelength with the largest intensity?
Did you try integrating over its spectrum?
 

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