MHT CET 2022 Physics question
Three discs x, y and z having radii 2 m, 3 m and 6 m respectively are coated on outer surfaces. The wavelength corresponding to maximum intensity are 300 nm, 400 nm and 500 nm respectively. If , and are power radiated by them respectively then
Answer: (B)
Solution
By Stefan's law the radiated power is (for a disc of given radius, area ), and by Wien's law , so . Using in units of 100 nm: ;
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