MHT CET202020 Oct 2020Morning ShiftPhysicsThermal Properties of MatterActual
Three black discs ' x ^ , ^ y ^ , ^ z ^ have radii 1 ~m , 2 ~m and 3 ~m respectively. The wavelengths corresponding to maximum intensity are 200,300 and 400 ~nm respectively. The relation between emissive powers 'Ex', 'Ey' and 'Ez' is
Options
- AEx > Ey < Ez
- BEx < Ey < Ez
- CEx = Ey = Ez
- DEx > Ey > Ez
Correct answer
D. Ex > Ey > Ez
Step-by-step solution
_ m T = k E = AT ⁴ ~A E T ⁴ E A ⁴ E _ x : E _ y : E _ z = 1 _ x ⁴ : 1 _ y ⁴ : 1 _ z ⁴ = 1 (200)⁴ : 1 (300)⁴ : 1 (400)⁴ E _ x > E _ y > E _ z