A surface with emissivity 0.8 and area $1\text{ m}^2$ is maintained at $500\text{ K}$ and is surrounded by air at $300\text{ K}$. Given Stefan–Boltzmann constant $\sigma = 5.67 \times 10^{-8}\text{ W/m}^2\text{K}^4$. What is the rate of radiative heat transfer?
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Always ensure temperatures are in Kelvin ($T$ in $\text{K}$) before performing any calculations involving the Stefan-Boltzmann law.
Using Celsius temperatures is a common source of error.