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Two spherical black bodies A and B,havin...

Two spherical black bodies A and B,having radii `r_(A)` and `r_(B) =2r_(A)` emit radiation with peak intensities at wavelength 400 nm and 800 nm respectively. If their temperature are `T_(A)` and `T_(B)` respectively in Kelvin scale, their emissive powers are `E_(A)` and `E_(B)` then :

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