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Three discs \( A, B \) and \( C \) having radii \( 2 m, 4 m \) and \( 6 m \) respectively are coated with carbon black on their other
\( \mathrm{P} \) surfaces. The wavelengths corresponding to maximum

W intensity are \( 300 \mathrm{~nm}, 400 \mathrm{~nm} \) and \( 500 \mathrm{~nm} \), respectively.
The power radiated by them are \( Q_{a}, Q_{b} \) and \( Q_{c} \) respectively
[IIT-JEE (Screening) 2004]
(a) \( Q_{a} \) is maximum
(b) \( Q_{b} \) is maximum
(c) \( Q_{c} \) is maximum
(d) \( Q_{a}=Q_{b}=Q_{c} \)
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