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

Three discs, A, B and C having radii 2m, 4m and6m respectively are coated with carbon black on their outer surfaces. The wavelengths corresponding to maximum intensity are `300nm, 400nm` and `500 nm`, respectively. The power radiated by them are `Q_A, Q_B and Q_C` respectively
(a) `Q_A` is maximum (b) `Q_B` is maximum (c) `Q_C` is maximum (d) `Q_A = Q_B = Q_C`

A

`Q_(a)` is maximum

B

`Q_(b)` is maximum

C

`Q_(c )` is maximum

D

`Q_(a) = Q_(b) = Q_(c ) 21`

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The correct Answer is:
B
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