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NTA Abhyas JEE Main2020PhysicsThermal Properties of MatterPractice

When the temperature of a black body increases, it is observed that the wavelength corresponding of maximum energy changes from 0 . 26 μm to 0 . 13 μm . The ratio of emissive powers of the body at the respective temperature is

Options

  1. A16 1
  2. B4 1
  3. C1 4
  4. D1 16

Correct answer

D. 1 16

Step-by-step solution

The body would appear red ∴ λ r > λ y λ y 1 λ y 2 = T 2 T 1 = 0.26 0.13 = 2 ∴ E 1 E 2 = T 1 T 2 4 = 1 2 4 = 1 16

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