Three discs A, B and C having radii 2, 4, and 6 cm respectively are coated with carbon black. Wavelength for maximum intensity for the three discs are 300, 400 and 500 nm respectively. If QA , QB and QC are power emitted by A, B and C respectively, then
a. QA will be maximum
b. QB will be maximum
c. QC will be maximum
d. QA=QB=QC