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NTA Abhyas JEE Main2020PhysicsThermal Properties of MatterPractice

A black body, at 200 K , is found to have maximum energy at a wavelength of 14 μm . When its temperature is raised to 1000 K , the wavelength at which maximum energy is emitted is

Options

  1. A14 μm
  2. B70   μm
  3. C2.8 μm
  4. D2.8 mm

Correct answer

C. 2.8 μm

Step-by-step solution

λ m 1 T 1 = λ m 2 T 2 ⇒ λ m 2 = λ m 1 T 1 T 2 = 14 × 200 1000 = 2.8 μm

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