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Heat Transfer
Convection & Radiation
GATE 2018
Easy

The peak wavelength of radiation emitted by a black body at a temperature of 2000 K is 1.45 μm. If the peak wavelength of emitted radiation changes to 2.90 μm, then the temperature (in K) of the black body is

  • A500
  • 1000
  • C4000
  • D8000

Explanation

Wien's displacement law: λmax×T = constant. T2 = T1×λ1/λ2 = 2000×1.45/2.90 = 2000×0.5 = 1000 K.

Source: GATE ME 2018 Session 2 (Set 2) (2018)

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