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Three discs A, B and C having radii 2 m,...

Three discs A, B and C having radii 2 m, 4m, and 6 m, respectively are coated with carbon black on their outer surfaces. The wavelengths corresponding to maximum intensity are 3 m, 4 m and 5 m respectively. The power radiated by them are `P_(A),P_(B)andP_(C )` respectively. Find the ratio of powers emitted by the three discs.

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