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NEET 2018 Physics question

PhysicsThermal Properties of MatterNEET 2018

The power radiated by a black body is and it radiates maximum energy at wavelength, . If the temperature of the black body is now changed so that it radiates maximum energy at wavelength , the power radiated by it becomes . The value of is

Answer: (1)

Solution

Wien's displacement law: . So , giving . Stefan's law: , so $ = ( =

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Question ID VK-092237