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Blackbody Radiation

dcm18
in Quantum Theory

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Hopefully someone can help me with this question because I am not sure....

 

Calculate the energy radiated by a spherical blackbody of radius 0.75 m at 1500K per second. What would the radius of a spherical blackbody at 2750 K be if emitted energy at the same rate as the blackbody of radius 0.75 m at 1500 K?

 

Any help would be great!

 

Thanks

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