Three discs,a, b,c having radii 2m,4m,6m respectively are coated with carbon black on their outer surface the wavelength corresponding to maximum intensity are 300,400,500nm respectively the power radiated by them are Q_A,Q_B,,Q_{c
Opts-}
Q_ais max
Q_bis max
Q_cis max
Q_a=Q_b=Q_c

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Solution

according to Wein's displacement law λT = constant

so ratio of temperatures of the three discs will be 1/3:1/4:1/5 = 20:15:12

and ratio of area of the discs = 1:4:9

now according to Stephan's law Q α A * T⁴

so ratio Q_a:Q_b:Q_c = 1(20)⁴ : 4(15)⁴ : 9*(12)⁴

on solving we will get that Q_bis maximum

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