A black body is at a temperature of 2880 K. The energy of radiation emitted by this object with wavelength between 499 nm and 500 nm is U 1 , between 999 nm and 1000 nm is U 2 and between 1499 nm and 1500 nm is U 3 . The Wien's constant 
. Then
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D
According to Wien's displacement law 
∴ ∴ 
i.e. energy corresponding to wavelength 1000 nm will be maximum i.e. U 2 will be maximum U 1 < U 2 > U 3
Energy distribution graph with wavelength will be as
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