Three discs A, B and C having radii $$2$$ m, $$4$$ m and $$6$$ m respectively are coated with carbon black on their outer surfaces. The wavelengths corresponding to maximum intensity are $$300$$ nm, $$400$$ nm and $$500$$ nm respectively. The power radiated by them are QA,QB and QC respectively.

Question

Infinity Learn · Accepted Answer

$$Q=$$σ$$AT4$$⋅ Here $$A=$$π$$r2According$$ to Wien's law λ$$mT=bor$$   $$T=b/$$λm      $$Q=$$σπ$$r2b/$$λ$$m4or$$   Q∝$$r2/$$λ$$m4$$ ∴ QB>QC>QA

Three discs A, B and C having radii 2 m, 4 m and 6 m respectively are coated with carbon black on their outer surfaces. The wavelengths corresponding to maximum intensity are 300 nm, 400 nm and 500 nm respectively. The power radiated by them are Q_A,Q_B and Q_C respectively.

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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 outer surfaces. The wavelengths corresponding to maximum intensity are 300 nm, 400 nm and 500 nm respectively. The power radiated by them are QA,QB and QC respectively.

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Ready to Test Your Skills?

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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 outer surfaces. The wavelengths corresponding to maximum intensity are 300 nm, 400 nm and 500 nm respectively. The power radiated by them are Q_A,Q_B and Q_C respectively.