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Heat Transfer

Q1: Stefan-Boltzman law which describes the radiation heat transfer states that, it is proportional to (where, t = temperature in °C T = absolute temperature in ° K )

A t4

B T4

C 1/t4

D 1/T4

ANS:B - T4

The Stefan-Boltzmann law, which describes radiation heat transfer, states that the radiative heat flux (Q) is proportional to the fourth power of the absolute temperature (T) of the radiating surface. Mathematically, it is expressed as: 4Q=σT4 Where:

  • Q is the radiative heat flux,
  • σ is the Stefan-Boltzmann constant,
  • T is the absolute temperature of the radiating surface.
So, the correct answer is: b) 4T4



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