Formula for net radiation rate between two black bodies - Heat Transfer

Q.  Consider two black bodies at temperatures T1 and T2 (T1 > T2) having same surface area A, are placed in vacuum. What will be the correct formula for net rate of radiant heat transfer between these surfaces?

Where σ is a Stefan-Boltzmann constant
- Published on 11 Aug 15

a. q = σ A (T1 – T2)4
b. q = σ A (T14 – T24)
c. q = σ A (T1 – T2)
d. none of the above

ANSWER: q = σ A (T14 – T24)

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