Three discs of same material A, B, C of radii 2 cm, 4 cm and 6 cm respectively are coated with carbon black. Their wavelengths corresponding to maximum spectral radiancy are 300, 400 and 500 nm respectively then maximum power will be emitted by
Text Solution
Verified by ExpertsThe correct answer is:
B
Q ∝ AT 4 and λ m × T = constant. Hence,
or 
Q A : Q B : Q C = 
= 
= 0.05 : 0.0625 : 0.0576
i.e. Q B is maximum.
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