Two bodies A and B have thermal emissivities of 0.01 and 0.81 respectively. The outer surface areas of the two bodies are the same . The two bodies emit total radiant power at the same rate. The wavelength λB corresponding to maximum spectral radiancy in the radiation from B shifted from the wavelength corresponding to maximum spectral radiancy in the radiation from A, by 1.00 μm. If the temperature of A is 5802 K
the temperature of B is 1934 K
Power radiated and surface area is same for both A and B .
= 1934 K
According to Wien’ s displacement law,
Note: λmT=B = Wien’s constant value of this constant for perfectly black body is 2.89×103 m-K. For other bodies this constant will have some different value. In the option (b) has different for different bodies. Option (b) is incorrect.